B6 S4 B7 S4 and RS4 built motors from JHM

B6/7 S4/RS4
#81

So you wouldn’t consider strapping the two major weak points of the stock exhaust back onto a brand new built motor doing it wrong? Regardless of how negligible you think the gains are going to be in comparison, the restrictive manifolds and precats being so close to the engine are what keep the heat trapped up there causing timing failures on top of other things. Plus, when did I say anything about them being better because their louder? They sound better, it’s as simple as that.

You said they weren’t in your budget, not me… http://www.audizine.com/forum/showthread.php/364797-Black-Avant-Thread?p=7736660#post7736660. So you’re telling me that while your car has been at JHM for what, the past 9+ months, you didn’t think they could crank out a set of headers in that time?

#82

Just to clear something up. The JHM headers actually make the car more tight in the exhaust tone. The JHM tuned headers collect the exhaust pulses and make the exhaust more tight. When you get untuned headers like the china junk its just the same as the Dps no difference intact as we have seen less power more noise.

Exhaust is the big part of our cars making power. RX what parts are you getting put on your car.

#83

I wouldn’t be so eager to jump on the taller sixth gear. After my long trip across the USA I can tell you that there is a lot of drone type noise when the engine is under heavy load when going up a huge hill. Also the best gas mileage that I got was 25.66 mpg on 91 octane when I am tuned for 93 octane. Seriously, if JHM comes out with performance scynros for the 0A3 trans than I am going to switch back to the stock ratio.

The exhaust sizing question is interesting. I wonder if the JHM RS4 cat back would fit a S4 like how the magna flow does.

#84

No I wouldn’t consider that doing it wrong. I consider doing it the way I want, which is right for me, simple as that. I never claimed you said the headers were louder, I know I said that. Would the car sound better? In all likelihood, yes, to you and me, but not to my wife. It would be louder inside the car with headers, period. The thicker cast manifolds deaden the sound some vs. thin walled headers and besides that, the high-flow cats should help alleviate some of the heat issues you (and others?) are concerned about. I wasn’t aware this was an issue regarding timing issues and won’t worry about it. In any case, the new engine had all new timing chains and guides installed to address that.

Comedy. That post was over a year and a half and two engines ago, 9 months before I dropped the car off with JHM. Things change, life is dynamic, not static. When JHM and I agreed to terms before my car sat there for 9+ months, there was uncertainty about the future availability of the headers and doubt in my mind if they were worth it. I was only going by what the boys themselves at JHM told me, simple as that. Besides, like I said earlier, my wife wasn’t to keen on the idea of a louder and stinkier car.

#85

I already had almost everything that could be upgraded performance wise, and then some, done before this with the exception of headers and the SC. I had posted a list of stuff on audizine sometime ago…perhaps mdubz could dig it up and reference it here.

All that is getting done now is the engine, SC, new clutch (not the flywheel), and JHM’s new crossrod, just because. New clutch should make the car easier for the wife to drive…she had issues with the last one, especially since we live in San Francisco.

#86

I think you guys should not argue and just agree to disagree, although it is proven that headers sound better than DPs…all around,not just to the performance gurus.

Both of you area out to have bad ass cars, just enjoy that shit.

#87

Based on my experience with the JHM headers, they make the car louder outside but its quieter while cruising in the cabin. The tone plays a big part in what sound intrudes into the cabin and I felt in my A6 it was more tranquil in the cabin with catless headers vs catted downpipes… Outside of the car it was very loud

#88

Well put beem. And a lot of the cabin volume depends on how much you’re getting on it. Stop and go and around town, the cabin noise was better with catless headers than it was with catless dp’s. But when you put your foot down fully, I guess you could hear a bit more in the cabin with the headers due to the extra exterior volume (but it’d be marginally at best).

JHM shoulda let ya slow xruis around in one of theirs. They may of even had a set of the cats they could put on theirs to really know exactly what it sounds like.

At the end of the day, Euro is right, just enjoy the shit out of these awesome machines. And I’d rest pretty comfortably in the fact that JHM wouldn’t sell a F.I. built motor package without their approval of the proper supporting mods. If they say it’s good, I’m sure it is.

#89

This is true. It looked pretty touch and go for the headers.

The fabrication method they used before was gone (guy/shop was out of commission) , and they were going to have to look at going with a production style method…which was going to take an unknown amount of time before it was up and running . Remember the RS4 exhaust went on hold for over a year? Same issue.

Since then as a stop gap, they have ‘continued’ with the handmade method on a one off basis. There aren’t shelves of headers in Lathrop. The future of headers is still uncertain.

It’s easy for JHM to put them on hold because as I have mentioned in the past, they’re a huge amount of work for very modest profit. The revenue looks pretty at 2750 a pop but revenue alone doesn’t make a business successful. Profits are kinda key lol.

#90

+1 on whether the stg2/3 B6/7 S4’s will benefit from 2.75"? Maybe the count or saki can comment from their direct experiences. I’m sure JHM will have tried both!

#91

Who else has header options for the b7? I tried the super sprint ones but they showed no beit

#92

B67 S4
JHM has headers for the B67 S4 for $2750. They work VERY well vs. the shitty manifolds that come on the car. With a JHM tune and catback, they added about 50 WHP and 60+ WTQ. Best we would see from JHM tune, catback +catless downpipes would be about 30-35 WHP and 40 WTQ…so the headers are great. Sound awesome, made of top quality material, tuned, equal length, great merge collector…just a great product. Expensive though, but that’s what it takes. JHM’s view is that you need top quality materials for these because they’re subjected to intense heat, and the last thing you want is to have to pull your motor again because your headers fail. You want super high end materials that will outlast the car.

There’s a China knockoff company that makes poorly designed ones that don’t actually fit the B67. It’s basically a scam to trick someone into buying them. They send you a $200 pile of poorly welded metal for $1000 and people think they’re getting a deal because they aren’t $2750 like the JHM ones

B7 RS4
Supersprint - waste of money as you found out. Poor design, horribly expensive, adds nothing vs. catless downpipes.

People with an RS4 would be smart to keep the quattro designed headers that come on the car. It’s like trying to fix something that isn’t broken. They work great, so stick with them.

#93

Oh I know euro, I’m not trying to argue, just aggressively trying to get him to see my point because his logic doesn’t seem to be there, especially about the sound factor. My DPs were extremely loud and nowhere near as refined as the headers. I’d like to see him have an awesome car and succeed at the track. But then, I guess it’s not even his car and his wife would divorce him if he bought them so I’ll just leave it alone. Just makes it easier for me to set some records at the strip :slight_smile:

#94

built motor catfight coming up…

#95

No Saki, I’m done lol. I’m just going to take euro’s advice and agree to disagree.

#96

you guys are arguing about nothing

the trakwagn will be a fucking weapon, with or without headers. He already has his car bolted up and put together. it is going through the third stage of breakin I believe, so to second guess his choices now is waste of time. He is comfortable in his choices, and they are already made, so secondguessing himself isn’t going to happen.

It’s not like he just sent his car to JHM and he’s considering what to buy from the menu. He already bought it. So, let’s see how it goes!

You guys should have a 1/4 mile challenge. See who is the boss at the strip instead of arguing about who bought what. You’ve both invested a serious amount of money in making your respective cars kick ass, so let’s have some fun.

#97

[quote=“sakimano,post:96,topic:5117”]
This is all I want. And I agree, the arguing is over nothing.

#98

Not arguing about the sound. As for it being louder in the car, I am only basing my decision on personal experiences with other cars, not this one. No doubt we will enjoy the cars.

Logical to me is all that matters in this case. Never understand why peeps, good intentions aside, try to convince others what is right for them is right for all.

Uncalled for and just wait until you get married, have a kid etc. Everything you do now is just practice.
Tit-for-tat: I’ll let you have the strip, but I’m sure my wife could show you the fast way around a proper racetrack, i.e., one with turns :-*

#99

All in good fun of course mdubz :slight_smile:

#100

Same here rx, I’m not trying to piss you off, I just get into it with things I’m passionate about.

It was… I apologize. I’m waiting as long as I can to pull the trigger on that one ;D But I will be taking it to the track too… the one with turns.