B8 A4 DIY: Catalytic Converter Removal & HFC or Test Pipe Install

[blbroo]

I think all models require the oxygen sensors to be removed since they are mounted to the cat...

Either way, good morning mate.

Holden Ute, so Aussie.

[boomtime]

I think all models require the oxygen sensors to be removed since they are mounted to the cat...

Either way, good morning mate.

Holden Ute, so Aussie.

Yes


Sent from my iPad using Tapatalk

[Shaph]

I think all models require the oxygen sensors to be removed since they are mounted to the cat...

Either way, good morning mate.

Holden Ute, so Aussie.

yeah your are right cant see the cat coming out with the oxygen sensor on.
We love utes so much, wouldn't consider selling mine if it wasn't manual. They get so tail happy.

[jamesj2k]

Do you guys know if this DIY works on an Audi B8 S4?

[The Infiltrator]

Do you guys know if this DIY works on an Audi B8 S4?

Look at the DIY on the first page... you tell me. You have an S4, this is for an A4.

[jamesj2k]

MOST A4 diy's are same if not similar to S4's. Yes, I can read.

[trackbaron]

MOST A4 diy's are same if not similar to S4's. Yes, I can read.

For cosmetic things yes, but the exhaust systems on these two cars are entirely different. Removal of the converter out of the pipe should be similar but uninstalling the pipe is different.

[Lambda13]

Are you drunk Andrew? After a while, they change color to that brown / copperish tone that the stock one has when you take it off. I am not sure they would notice my HFC but the spaced out O2 sensor is obvious. Luckily, the guy that just installed my muffler mentioned that he doesn't go looking for trouble if the ODB2 scans ok on inspections.

I'm going to pretend I didn't make that post...

If it were to be an issue, I was thinking more along the lines of heat wrapping it.

Dammit it got quoted twice...

10-4 we're all clear. Nothing to see here people. Move on.

[The Infiltrator]

For cosmetic things yes, but the exhaust systems on these two cars are entirely different. Removal of the converter out of the pipe should be similar but uninstalling the pipe is different.

This!

[blbroo]

I am pretty sure that there is no performance benefit of HFCs on the b8 S4. Never see it talked about up there and have seen some old poor reviews of the 034 product.

The S4 forum is a much better place for the question than here.


^ I typed that with my thumbs! using tapatalk

[trackbaron]

FINALLY get to use this diy! Been shopping for awhile now but finally pulled the trigger. Seems like end of the season gave way to some good discounts and I'm super pumped to get this bad boy on!


http://www.audizine.com/gallery/data/500/testpipe2.jpg

[Lambda13]

Anyone have a link to the mini cat spacer? I can't recall who made it but I have a feeling I'm going to need one for emissions.

[trackbaron]

Anyone have a link to the mini cat spacer? I can't recall who made it but I have a feeling I'm going to need one for emissions.

+1 I'm on stock tune so I expect a cel without it. I'm guessing there are different sizes too.

[Lucid]

thx for the write up!!!!

my test pipe will be in any day!!!


ANYONE FROM AZ with vcsd tool?? i need to code my headlights :)

[heffer]

FINALLY got mine installed! It freaking sucked! But honestly I expected it. I definitely hear the turbo more now. I noticed a decent amount of power gain on my first run with it, I had my brother in the car so I'll be able to tell better tomorrow. Regardless, thanks for the DIY but I'll never attempt this install again! I'm on a stock tune BTW.
Oh I almost forgot. My car is smoking a good amount, PB blaster burning maybe?

[Townending]

Surprisingly, this was my only mod where I didn't have a single hiccup. Everything went smoothly.

It took 175 miles for my CEL to come on due to test pipe. No spacers.

[trackbaron]

Surprisingly, this was my only mod where I a single hiccup. Everything went smoothly.

It took 175 miles for my CEL to come on due to test pipe. No spacers.

What did you go with?

[Townending]

What did you go with?

Ebay test pipe. Only paid 60$.

It's been on for 4k miles so far, full throttle up to 150+MPH, no issues at all.

[lostkeyz]

Ebay test pipe. Only paid 60$.

It's been on for 4k miles so far, full throttle up to 150+MPH, no issues at all.

Are you still running a stock tune or using a spacer. I decided not to mess with the spacer anymore and go stage 2.


Sent from my SAMSUNG-SGH-I537 using Tapatalk

[Townending]

Are you still running a stock tune or using a spacer. I decided not to mess with the spacer anymore and go stage 2.


Sent from my SAMSUNG-SGH-I537 using Tapatalk

I run Stage 2 on E85. My whole reasoning to get the ebay test pipe was to go from Stage 1 to Stage 2 as cheap as possible to hold me over until I'm ready for Stage 3.

-Test pipe : $60
-OEM Gaskets/Nuts : $20
-Labor Fee for Stage 2 flash : $55

Total Cost to go from Stage 1 to Stage 2 : $135

[heffer]

I have the 034 spacer and threw a cel already....

[Townending]

I have the 034 spacer and threw a cel already....

What's stopping you from getting a tune?

[heffer]

What's stopping you from getting a tune?

lack of funds. I will at some point, but don't know when that will be.

[Linksman72]

I just installed mine and noticed a lot of white smoke coming from the hfc area. I'm wondering too if it's the PB blaster burning off or something more serious

[boomtime]

I just installed mine and noticed a lot of white smoke coming from the hfc area. I'm wondering too if it's the PB blaster burning off or something more serious

Anything other than metal will burn off after 100 miles. The new ss pipe usually has a glaze from being made but also fingerprints and pb blaster will smoke too.

If anyone else is interested im selling my 3" SS TP and SS downpipe section to remove the pretzel resonator after the flex joint shoot me a PM. $200 for both pieces. 034 and USP...


Sent from my iPhone using Tapatalk

[RW12]

I haven't installed a HFC, but from having done other exhaust work, I would suggest after you install the pipe, spray it down with brake clean. That will remove most of the oil and grease and minimize smoking.

F*ck I love brake clean.

[julianwh]

Great write up, my mechanic friend and I were able to complete the install. That one bolt till about 15 mins to figure out and ended up getting it out with a short ratchet with the little space behind the engine. I'm very happy with the 034 & I feel like I have a new car. Sounds great and better pedal response. CEL came on almost immediately but I was expecting it. APR Stage 2 flash fixed it.

[Zactastic]

Should i disconnect the negative battery terminal or both + and - when doing this install? just curious if that helps for when i turn the car back on with the new cat to avoid CEL

[o1turbo30v]

Should i disconnect the negative battery terminal or both + and - when doing this install? just curious if that helps for when i turn the car back on with the new cat to avoid CEL

No, it won't help the CEL will eventually come on regardless, you have to go stage 2 from revo or apr.

[Zactastic]

No, it won't help the CEL will eventually come on regardless, you have to go stage 2 from revo or apr.

well, i do have a 90 degree spacer going in while i wait 2 more weeks for the RocEuro 45 degree spacer i have on back order. If i do get a CEL i guess ill have to go stage 2 :) If that's the case, when i do need to smog out here in CA, would i need to revert back to stock ECU? I am aware ill have to swap out the HFC for stock cat again at that point. the reason im hesitating going stage 2 is because of smog check. basically, would a stock cat with stage 2 be able to pass smog? I probably wouldnt want to drive it like that because of the stock cat restricting flow on stage 2 programing. please elaborate if you will, im clearing new at this

[Zactastic]

Got it all hooked up except that "shock absorbing link assembly that connects the lower portion of the cat pipe to the engine" . it's at a slight angle, cant get the bolt threaded in there. anyone else have this issue and how did you resolve it? ill send a picture, right now it's attached to the cat only, no bolt in place.

[Zactastic]

.



Here's where I can't get the right angle for the bolt to engage and thread


Sent from my iPhone using Tapatalk

[lettuce]

Here's where I can't get the right angle for the bolt to engage and thread


Sent from my iPhone using Tapatalk

Have you tried unbolting it from the cat, bolting it up to the transmission and then trying to thread it onto the cat instead? I believe that's what I did and didn't have any issues.

[Zactastic]

Have you tried unbolting it from the cat, bolting it up to the transmission and then trying to thread it onto the cat instead? I believe that's what I did and didn't have any issues.

I loosened it from the cat to give it more play... but ill try your suggestion. thanks man. time for a beer after that!!

[earhythmic]

^^^figure that out and you can help me with mine when I go stage 2! I'm 5 miles away from you in Hercules 😬

[Zactastic]

^^^figure that out and you can help me with mine when I go stage 2! I'm 5 miles away from you in Hercules 😬

Nice man, ill be cleaning it up tomorrow morning and checking all the bolts again before i take her for a spin. This DIY thread really helps.

[Linksman72]

.



Here's where I can't get the right angle for the bolt to engage and thread



Sent from my iPhone using Tapatalk

I had this same problem a couple weeks ago, unscrew the link and rotate or flip it so the spring is attached facing the opposite direction. Attach it on the other side of the cat. It fits perfectly this way.

[Zactastic]

I ended up unscrewing it off the cat, gave it a slight bend, and it fit nice and snug.


Sent from my iPhone using Tapatalk

[Zactastic]

Went for a spin, felt the added response and it sounds just bit deeper than stock. More noticeable in the sound when accelerating. I'm really happy with the 034 so far. Great DIY


Sent from my iPhone using Tapatalk

[Allowencer]

I'm just gonna leave this here: