JHM Longtube Header Thread

[Bpitz15]

I think these works of art need their own thread and this would be a great place for JHM to give us updates on only these headers.


Here are the header flanges


The Header Prototype


Beta testing set installed


Quotes from JHM:
Header Specs:
"We plan on making it bolt to any 2.5" aftercat that is NOT necked down. So the header will completely replace the stock manifolds and your downpipes. If you happen to have a cat back that is knecked down for a stock downpipe then you will just need small section of 2.5" pipe welded on. There would be no point in buying headers and lowering your motor for the install then negate the gains with a necked down pipe. Also if you have a 2.25" cat back it will limit the headers as well. We do plan on cat and no cat options as well.

And we are currently building jigs for these headers and a JHM cat back exhuast system as well."


Estimated Price:
"$2,500 base. Added money for cats (still need to work out the details on this). Also the 02 sensors need the wires lengthened so either the installer can do it or we will sell a high quality extension kit to splice in or totally new 02 sensors with longer wires."

Performance:
"We already have 2 cars running with them and the mid range (2500 to 5000rpm) was a healthy gain due to the nice long primary tubes (optimized based on our engine size and design). Above 5000rpm the gain is good as well but not as great as lower in the band, we attribute this to the STOCK intake manifold and will be looking into a ported intake manifold exchange program once we get everything else released."

Farmerbobs Car:
"His car is planned to receive the 3rd set of longtube headers we are building. We should have one car running this weekend and then another one soon after then his car. After those three are done I will hit the track with his car again. At that point I will also officially release the headers for sale."


And a couple quotes from the few lucky bastards who were allowed to see them in person:

Justincredible:
"......................

lol that about said it all for me. WOW The set I saw you guys install I never saw them in that way as they were already on the car. Thanks for letting me and the other guys get the sneak peak when you came to Mi.

From the install I saw the fit is nice still with the equal length there is a small amount of room left between the frame rail and the body. The set we saw was on the car and it hooked right up to the aftermarket cat back."


cabracco85:
"I also had the chance to get a sneek peek at these headers, All i can say is they are of great quality and the welds look awesome. The headers are well thought out and should be a must for anyone wanting to make some good power. There is a little more room for the 6spd guys as the auto trans is thicker. But they still clear and fit with the long primaries for the auto cars.

Thanks JHM and all parties involved in making such a great product for our cars. I cant wait to get a set of these on my car, but there are other things that i have to worry about. SO im probally a year off until i can get these bad boys on my car. Thats if work picks back up."


Here is to JHM for being pioneers to the Audi 4.2 V8 performance!!

[joeycuccaro]

Starting the savings fund for them now.

[littleredwagen]

Starting the savings fund for them now.

oh great i guess we are pulling your motor

[joeycuccaro]

oh great i guess we are pulling your motor

I figure its the next best step. Im getting bored of doing just valve covers and pulling the front bumper. Oh and let me tell you, 190 nm comes to about 140 ft pds. Those suckers are on there TIGHT!

[Bpitz15]

Header install GTG???
Should take a week or so!! Haha

[Devitan]

My new wheels fund is being moved into the JHM headers fund. And I just got DP's for my car.

[joeycuccaro]

Header install GTG???
Should take a week or so!! Haha

Looking forward to it.

[Bpitz15]

My new wheels fund is being moved into the JHM headers fund. And I just got DP's for my car.

you should be able to get quite a bit of $$ back by selling the DP's.
Thats my plan...

[42of250]

Starting the savings fund for them now.

x2 I cant wait JHM is REALLY coming through for us, for a while i didnt think there was much hope but now, i got to to go change my underwear haha

[beecha91]

So how much are the sperm banks paying these days??

Don-

[SuperAvant]

So how much are the sperm banks paying these days??

Don-

Great idea! So pumped for these babies...

So the engine doesnt need full removal or?

[2PUTT]

looks great! let me play devil's advocate...coming from a person who tests things for a living, due to stress, vibration, and heat, what are the chances of the welds cracking or one of the sections failing? i have seen it happen before. it is always a possibility.

[Bpitz15]

looks great! let me play devil's advocate...coming from a person who tests things for a living, due to stress, vibration, and heat, what are the chances of the welds cracking or one of the sections failing? i have seen it happen before. it is always a possibility.

Quoted from cabracco85
"All i can say is they are of great quality and the welds look awesome."

i guess there is always a possibility but knowing JHM, they don't put out a shotty product. That would be the least of my concerns.

[Mokes]

Saving up now!

[Justincredible]

looks great! let me play devil's advocate...coming from a person who tests things for a living, due to stress, vibration, and heat, what are the chances of the welds cracking or one of the sections failing? i have seen it happen before. it is always a possibility.

Obviously there is always got to be thought about this possibility but when you see they actual part it is very well thought out.

That being said Ive Never once seen a Chevy,ford, dodge long tube header crack and those guys would use no flex joints and just have the exhaust hang off the header I doubt we would see that here. At the end of the headers are flex joints to absorb the cat back with the JHM design

Let me put it this way. I left a deposit with Jay 5 min after seeing the headers and Im a testing, tight money person.

[RudeBwoi]

My new wheels fund is being moved into the JHM headers fund. And I just got DP's for my car.

i am in no way an exhaust expert, but do these replace dps or piggie pipes? doesnt it go headers > dp / piggies > catback?

[Bpitz15]

i am in no way an exhaust expert, but do these replace dps or piggie pipes? doesnt it go headers > dp / piggies > catback?

these bolt right to the motor and allllll the way down to the cat-back exhaust

there will be no need for Downpipes or piggie pipes.

[Bravest NY S4]

WOW....

[1FastS4.Com]

Holy shit!! Badd ass. I wonder how these will sound.

[Bpitz15]

Holy shit!! Badd ass. I wonder how these will sound.

hopefully even remotely similar to this
http://www.youtube.com/watch?v=rst2Q0ABPts

[SuperAvant]

hopefully even remotely similar to this
http://www.youtube.com/watch?v=rst2Q0ABPts

Does Kevin still have these on his car? I remember going to COI and he must have had his resonators on...

[GameBreaker]

Holy shit!! Badd ass. I wonder how these will sound.

x2 on that! Any word on the positioning of the cats? On my Mustang there is no room for them on the Longtubes, and they can only fit on the H-pipe. Are they considering moving the cats that far back for our cars?

[richib86]

bpitz15: kevins car has JUST a catback, cooks custom headers is the name of the company that made him his exhaust, he has stock headers and stock dp's

[drew]

sweet! i guess i will hold of on getting downpipes to see how this unfolds.

[cabracco85]

x2 on that! Any word on the positioning of the cats? On my Mustang there is no room for them on the Longtubes, and they can only fit on the H-pipe. Are they considering moving the cats that far back for our cars?

There will be cat option or not cat options. It seems like it will be right about the same place as the main cat sits with the stock dps. If anything it will be moved back just a little bit. Jay would have to comment to make 100% sure on this.

[cabracco85]

sweet! i guess i will hold of on getting downpipes to see how this unfolds.

I would, or if you must have dps just get the jhm piggie pipes for now.

[Todeshandler]

where do i send my deposit?????

[sway]

I didn't know jhm made a cat back as well, I didn't see it on there website. Does anyone have them along with some vid/audio clips?

[cabracco85]

I didn't know jhm made a cat back as well, I didn't see it on there website. Does anyone have them along with some vid/audio clips?

I think they are in the process of getting some done. But i could be wrong. We will have to wait for jay to chime in here and give us the word on the catback.

[drew]

hopefully even remotely similar to this
http://www.youtube.com/watch?v=rst2Q0ABPts

that sounds mean! if it can sound like this with some of the rasp taken out, i will be in heaven!

[Captain Insano]

WOW....

What he said ^^^^

I will have these on my car at some point. I promise you that.....

A little bird sent me a video clip from a beta car. After hearing the sound of the header with a custom catback..... The word "boner" about sums it up.

[drew]

What he said ^^^^

I will have these on my car at some point. I promise you that.....

A little bird sent me a video clip from a beta car. After hearing the sound of the header with a custom catback..... The word "boner" about sums it up.

dude you gotta share that clip cuz you just gave me a case of blu balls...

[cabracco85]

What he said ^^^^

I will have these on my car at some point. I promise you that.....

A little bird sent me a video clip from a beta car. After hearing the sound of the header with a custom catback..... The word "boner" about sums it up.

Hopefully you will have them before we go to the track. I would also like to hear a clip of them too.

[Captain Insano]

Hopefully you will have them before we go to the track. I would also like to hear a clip of them too.

There is a good chance I'll have them by the time we hit the track.

[cabracco85]

There is a good chance I'll have them by the time we hit the track.

Sounds good, lol

[RudeBwoi]

these are sounding better and better....

[Devitan]

That RS4 clip sounds SICK...

[04v8s4]

So you are saying these headers replace the current downpipe assembly? If that's the case i guess i dont understand how they are going to develop a catted option without compromising the emissions / cat life / and power?

Seems like the cat would have to be at the VERY end of the header...and change power gains and cat efficiency?

Headers look sick though.

[cabracco85]

So you are saying these headers replace the current downpipe assembly? If that's the case i guess i dont understand how they are going to develop a catted option without compromising the emissions / cat life / and power?

Seems like the cat would have to be at the VERY end of the header...and change power gains and cat efficiency?

Headers look sick though.

The headers do eliminate the dps, but the cat will be about the same place as where the stock cat sits. If anything it will be slightly further back, but not by that much. The cat will take alittle bit of power as opposed to the no cat option. But the gains should be good even with a cat. Im not sure about the efficiency of the cats, i would imagine it wouldnt compromise anything. I am not 100% on this so maybe jay will chime in and clear anything up that i may have messed up or missed.

[Monchichi8]

JHM...I would just like to say "Thank You!" This is exactly what our cars have needed!