Which HFC? JHM, 034 or CTS... any others?

[danbfree]

So first off, not interested in a test pipe, for many reasons, so no thanks to any tips there... So I'm looking for a HFC as my first official mod and am not sure which one to go with... I know JHM is excellent but there are other choices like the 034 and CTS I've seen out there as well... I understand the 034 may need an extra O2 spacer not included but more importantly I want the easiest installation and least possibility of CEL. I am in a state with emissions, but no visual check or sniffer test (OBD only) so as long as I don't throw a code or am running smelly I should be good. I just got the car recently and my shop said that my CEL doesn't even come on when it should at startup, so I have no idea what this means either...Thanks in advance!

[Linksman72]

I have a 034 hfc with a O2 spacer. I have had no problems. I don't think 034 makes the spacer anymore.

[danbfree]

I have a 034 hfc with a O2 spacer. I have had no problems. I don't think 034 makes the spacer anymore.

Ah, OK... I see you have plenty of mods, would you say that HFC is a good way to go as a very first mod before even a tune? I do get a lot of heat soak on these really hot days to where there is a like a full 2 second delay before there is any power, without going into an upgraded intercooler... will the HFC at least help there to get my turbo spooled up quicker you think?

[rongeur]

034 or JHM are excellent choices, I run the CTS FMIC and it is great quality but no experience with their exhaust offerings.

[adam044]

034 or JHM. Whichever you can find cheaper. I think they are both very similar. I think one does flow better though.

But honestly.. get a test pipe noob.

[Linksman72]

Looks like JHM has a build in O2 spacer they call "j-bung" they say it should prevent any CEL.

[danbfree]

034 or JHM. Whichever you can find cheaper. I think they are both very similar. I think one does flow better though.

But honestly.. get a test pipe noob.

Honestly, I've done my research and I'm not interested in running stinky and dirty for what has been said is a 2HP difference when I DO have emissions in my state... It's only an OBD test but I can't be running stinky with dark/rich exhaust though either and I do want to run fairly clean on a daily basis. So, as in the first thing I said, I have my reasons so there is no reason to argue philosophical differences, unless you are just messing with me ;)... Anyway, I'm only a noob to the 2.0t FSI, my last B6 3.0 had a Milltek exhaust and it sounded nice but p.o. never bothered with high flow cats. I know with a turbo now it's THE most restrictive thing there is in the whole exhaust so I want to start there... So getting back to the cat itself, the JHM has 300 cells and the 034 is 250... I'm assuming less cells is less restrictive but I also want to have the least chance of failing emissions down the road and do want to run at least halfway clean.

[danbfree]

Looks like JHM has a build in O2 spacer they call "j-bung" they say it should prevent any CEL.

Thanks... they cost a bit more than others but seem to be engineered better so looks like it's worth a bit extra cost at $370.. The CTS is $280, has 2 O2 sensor bungs with *option* for a 3rd... Since my car has CA emissions (but only need to pass OBD test in my state) it sounds like I will need the 3rd bung, so maybe going with the JHM would be the best way to go.

[vce1232000]

Honestly, I've done my research and for what has been said is a 2HP difference .

1st off I respect your decision not to run a test pipe. Your car, your decision, your mod.
The 2hp difference your referring is only on the top end. There is another gain in using a test pipe that I saw as a positive for me. The spool up time is .

[Hugh@EuropaParts]

We have the 034 HFC in stock! $330.00 shipped with all hardware and gaskets.

034MOTORSPORT HIGH FLOW CATALYTIC CONVERTER (A4 B7 2.0T)

[Jake@JHM]

Thanks for the support guys

https://jhmotorsports.com/shop/catal...0t-p-1893.html

[danbfree]

1st off I respect your decision not to run a test pipe. Your car, your decision, your mod.
The 2hp difference your referring is only on the top end. There is another gain in using a test pipe that I saw as a positive for me. The spool up time is .

Nice... ya, I'm sure a test pipe is definitely better performance-wise including spool-up time, I guess that's a compromise I'm willing to make to run clean... My buddy has an old DSM (I used to as well) and he runs test pipes but just not my thing. But I really do appreciate all your input as well, I love to learn as much as I can! :)

[danbfree]

We have the 034 HFC in stock! $330.00 shipped with all hardware and gaskets.

034MOTORSPORT HIGH FLOW CATALYTIC CONVERTER (A4 B7 2.0T)

Thanks, I am definitely considering ordering from you guys, you are on my short list of part suppliers to always check out... I DO need to know if my Tiptronic Quattro will require an O2 spacer that is no longer available... Thanks!

[danbfree]

Thanks for the support guys

https://jhmotorsports.com/shop/catal...0t-p-1893.html

I'm definitely looking at you guys as "in the lead" right now due to not needing any additional O2 spacers and an obviously well engineered unit... but I am also considering shipping/overall cost as well but sounds like it's probably worth the bit of additional cost for less issues. :)

[Hugh@EuropaParts]

Thanks, I am definitely considering ordering from you guys, you are on my short list of part suppliers to always check out... I DO need to know if my Tiptronic Quattro will require an O2 spacer that is no longer available... Thanks!

034MOTORSPORT OXYGEN SENSOR SPACER in stock... and no need for additional hardware as it's included with the HFC.

[danbfree]

034MOTORSPORT OXYGEN SENSOR SPACER in stock... and no need for additional hardware as it's included with the HFC.

Thanks! With this part being the same price just about everywhere with free shipping, you guys get my order for taking the time to help here... Unless anyone else has any input?

[pezgoon]

I do agree with you on the HFC, Adam044 you gotta let me know when you try and get inspected how it goes, I'm curious if they will say anything when/if the smell it

The only other reason to run a test pipe is if your going to do a 100+ octane tune and you wanna run race fuel (not all but some) has lead in it which obviously will not play nicely with the cat

[danbfree]

I do agree with you on the HFC, Adam044 you gotta let me know when you try and get inspected how it goes, I'm curious if they will say anything when/if the smell it

The only other reason to run a test pipe is if your going to do a 100+ octane tune and you wanna run race fuel (not all but some) has lead in it which obviously will not play nicely with the cat

Thanks, also good to know, I've been out of the turbo game for awhile... I'm only going to be going with a 91 Octane tune... Strangely we get 92 octane in Oregon/Washington, right in between the 91 for Cali and 93 most of the rest of country gets... so looks like I'm stuck at 91 octane unless I always ran some octane boost... hmmm... Nah, better be safe and stick with 91 octane.

[adam044]

I do agree with you on the HFC, Adam044 you gotta let me know when you try and get inspected how it goes, I'm curious if they will say anything when/if the smell it

The only other reason to run a test pipe is if your going to do a 100+ octane tune and you wanna run race fuel (not all but some) has lead in it which obviously will not play nicely with the cat

I'll pass. I shouldn't but I will. I already checked with my mechanic before I had it done. And he didn't say "no I won't pass you." He just said its really not worth the hassle dealing with the CELs and stuff for a street car that comes with installing a test pipe. I beg to differ lol. I have no CELs, if I had a CEL for it I think it'd be a different story. I'm a while away from inspection (April)

I just threw in the get a test pipe comment to troll a little lol.

[vce1232000]

Ive passed twice NJDMVC on the legit going state run facilities. We have 2 year inspection stickers here. No sniff or inspections. OBD2 port inspection only.I always 1 of the readiness tests. The APR tune codes out the rear O2 sensor.

[034Motorsport]

I have a 034 hfc with a O2 spacer. I have had no problems. I don't think 034 makes the spacer anymore.

034 or JHM are excellent choices, I run the CTS FMIC and it is great quality but no experience with their exhaust offerings.

034 or JHM. Whichever you can find cheaper. I think they are both very similar. I think one does flow better though.

But honestly.. get a test pipe noob.

We have the 034 HFC in stock! $330.00 shipped with all hardware and gaskets.

034MOTORSPORT HIGH FLOW CATALYTIC CONVERTER (A4 B7 2.0T)

034MOTORSPORT OXYGEN SENSOR SPACER in stock... and no need for additional hardware as it's included with the HFC.

Thank you guys for recommending our products! We are flattered to hear you are enjoying our products so much that you would recommend them to other enthusiasts!

If you guys have any questions please feel free to contact me via Pm or Hugh@EuropaParts!

Cheers,
Stefan@034

[adam044]

Thank you guys for recommending our products! We are flattered to hear you are enjoying our products so much that you would recommend them to other enthusiasts!

If you guys have any questions please feel free to contact me via Pm or Hugh@EuropaParts!

Cheers,
Stefan@034

No problem! That'll be $99.99 please.

[rongeur]

I do agree with you on the HFC, Adam044 you gotta let me know when you try and get inspected how it goes, I'm curious if they will say anything when/if the smell it

The only other reason to run a test pipe is if your going to do a 100+ octane tune and you wanna run race fuel (not all but some) has lead in it which obviously will not play nicely with the cat

I have run the 034 HFC (with an old stasis exhaust) and the sound, quality and performance was excellent. Did not pass CA sniffer (passed visual). HFC will keep drone and overall casual driving way more bearable.

I currently run a JHM TP with their FI B6 S4 exhaust. Sound great at WOT but is drony on a longer drive. The TP flows the best but does stink (my wife thinks we are all going to die of fume inhalation).

I am temped to go back to a HFC just to control my drone some more, we'll see, but something to definitely consider for daily driving: Drone Factor

[vce1232000]

I have run the 034 HFC (with an old stasis exhaust) and the sound, quality and performance was excellent. Did not pass CA sniffer (passed visual). HFC will keep drone and overall casual driving way more bearable.

I currently run a JHM TP with their FI B6 S4 exhaust. Sound great at WOT but is drony on a longer drive. The TP flows the best but does stink (my wife thinks we are all going to die of fume inhalation).

I am temped to go back to a HFC just to control my drone some more, we'll see, but something to definitely consider for daily driving: Drone Factor

I have a branch resonator on my exhaust and there is no drone. The smell is still there thou

[adam044]

I'm straight back from the turbo to dual mufflers. I have no drone at all on the highway just cruising.

Now with my B5 A4 which had a HFC to a muffler, oh. my. You couldn't have a conservation in the car cruising on the highway. Or at any time for that matter. It was brutal.

[whiteq]

I am running a 034 HFC with the stock exhaust and Revo Stage 2+ and love it, really nice quality

[danbfree]

I am running a 034 HFC with the stock exhaust and Revo Stage 2+ and love it, really nice quality

Since my shop does REVO tuning I think I'll go with that... Just Stage I to start. :)

[rongeur]

I have a branch resonator on my exhaust and there is no drone. The smell is still there thou

I had a 1/4 wavelength branch delete fabbed for my stasis and it did help some, but the drone difference with hfc vs tp even with the branch is still night and day.

[whiteq]

Im really happy with the REVO stage 2+, I am in Australia though so not as many options live over there, if I had the chance I probably would have tried JHM, I'm not that fussed though as it is only a spare car to thrash around it and stage 1 was nice but 2+ is really good with a nice little change in exhaust note as well.

[vce1232000]

I had a 1/4 wavelength branch delete fabbed for my stasis and it did help some, but the drone difference with hfc vs tp even with the branch is still night and day.

I had to the length a few times to get it rite. Afterwards it was

[StatusQuo]

I am of the "go catless or go home" type.

If you must, I hear good things about the 034 HFC. Herd some folks in California passing smog with it.

Sent from my Nexus 6P using Tapatalk

[danbfree]

I am of the "go catless or go home" type.

If you must, I hear good things about the 034 HFC. Herd some folks in California passing smog with it.

Nice, thanks for tip, I'm 95% sure I'm going with the 034 after all the good info posted here... If it passes smog, even accidentally sometimes, then thats good enough for me, It's not like I chose to buy a Prius, I'm very OK with "clean enough".

[StatusQuo]

Nice, thanks for tip, I'm 95% sure I'm going with the 034 after all the good info posted here... If it passes smog, even accidentally sometimes, then thats good enough for me, It's not like I chose to buy a Prius, I'm very OK with "clean enough".

Hahaha yeah I feel ya.


Little do people know that the majority of greenhouse gasses come from livestock, coal use (electricity), and commercial diesel use.

Passenger cars are a small fraction of the bigger picture.

But don't tell a Prius driver this lol.

-----

I got a 3inch catless running e85. E85 burns cleaner than gas :)

If I had testing equipment, I wonder how my setup compares to a full gas car with a stock cat.

Sent from my Nexus 6P using Tapatalk

[pezgoon]

Hahaha yeah I feel ya.


Little do people know that the majority of greenhouse gasses come from livestock, coal use (electricity), and commercial diesel use.

Passenger cars are a small fraction of the bigger picture.

But don't tell a Prius driver this lol.

-----

I got a 3inch catless running e85. E85 burns cleaner than gas :)

If I had testing equipment, I wonder how my setup compares to a full gas car with a stock cat.

Sent from my Nexus 6P using Tapatalk

Livestock is actually more than 50% production of greenhouse gasses at this current point (going to go up with more people) not only from the cows everywhere, but also through the unbelievable amounts of legal and illegal deforestation done to farm them, so the effect is now becoming exponentially worse as production increases and the planets ability to heal decreases.

[mgfranz]

I am temped to go back to a HFC just to control my drone some more, we'll see, but something to definitely consider for daily driving: Drone Factor

Nah, just sell me your HFC...

[mgfranz]

We have the 034 HFC in stock! $330.00 shipped with all hardware and gaskets.

034MOTORSPORT HIGH FLOW CATALYTIC CONVERTER (A4 B7 2.0T)

Thanks for the support guys

https://jhmotorsports.com/shop/catal...0t-p-1893.html

034 HFC and O2 spacer, shipped free from Europa $350. JHM HFC & hardware kit, $17.85 shipping + $30.80 CA tax for a total of $433.20... Come on Jake, you can do better than this.

[4ty-phive]

Ok, I guess I'll fess up....I just install the HFC from CTS about a week ago. I installed a O2 spacer (just in case) and it's mated to a BB exhaust. It is one of the quietest setups I've ever experienced and I love it. It was exactly what I was looking for. I can feel the turbo "come on" quicker but I get none of the drone. It's a tad bit louder than stock. I have no CELs and it's just great. I ordered my HFC from ECS Tuning, which in turn, ordered it from CTS. I mention this because it took a while for it to get to me. I think CTS had to actually make it (not off the shelf, I guess) and so it seemed like forever for it to get to me. I don't know if this helps or not, but at least you know that some of us run that "other" brand

[Okedokey]

Livestock is actually more than 50% production of greenhouse gasses at this current point (going to go up with more people) not only from the cows everywhere, but also through the unbelievable amounts of legal and illegal deforestation done to farm them, so the effect is now becoming exponentially worse as production increases and the planets ability to heal decreases.

Nonsense.

[Jake@JHM]

034 HFC and O2 spacer, shipped free from Europa $350. JHM HFC & hardware kit, $17.85 shipping + $30.80 CA tax for a total of $433.20... Come on Jake, you can do better than this.

The high quality cat we use costs way to much unfortunately.

[keaton85]

Would a group buy cut down on the cost at all?