Let's talk exhaust and Prochargers.
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
Let's talk exhaust and Prochargers. My current setup is a D1SC, 4.00" blower pulley, ATI 7.65" crank pulley, FMIC, 3" charge pipe to the throttle body. FAST 90mm intake, PI (MAST) heads, QTP original style long tubes, 1 3/4", Kooks 3" ORY, Magnaflow catback. Right now I'm seeing ~195kpa at 6800rpm, and was wondering how much of a gain in power, and drop in boost pressure I'd see going with a set of 1 7/8 long tubes. I'm stock cubes, forged of course.
Ideally, I thought about going to the 1 7/8" longtubes, 3" ory, and then a 3.5" or 4" intermediate pipe. But I've heard debates saying that as the exhaust moves away from the motor and starts to cool, you need less exhaust volume to keep the velocity up.
If I go with the larger long tubes, I'm going to have them ceramic coated to keep the temps in the headers and the velocity up.
So is it worth it?
Ideally, I thought about going to the 1 7/8" longtubes, 3" ory, and then a 3.5" or 4" intermediate pipe. But I've heard debates saying that as the exhaust moves away from the motor and starts to cool, you need less exhaust volume to keep the velocity up.
If I go with the larger long tubes, I'm going to have them ceramic coated to keep the temps in the headers and the velocity up.
So is it worth it?
I have a similar setup but have 1 3/4 going into a custom true dual setup. I have asked this question to myself several times is it worth changing. I'm really interested in hearing feedback.
How much power are you putting down?
How much power are you putting down?
I am going with kooks 1 7/8" headers, 3" y and a mufflex 4" with a magnaflow muffler. I think going with larger headers will net you a decent gain. I am making that assumption based on what people gain when switching to larger headers on na setups. Combine that with a 4" intermediate pipe and you should pick up quite a bit.
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
Yeah, I think it's definitely worth it, how much, who knows. How much power do I make now? No clue, dyno'ing the car has never been a big concern or priority for me.
You should feel the difference with the swap when you drive it no doubt, your gonna let her breathe good. Always heard good things about ARHs being very effective on Procharger setups.
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I am thinking about putting a D1 on my setup...already have kooks 1 7/8 and kooks true duals. From what I have seen 1 7/8 headers show gains on a bolt on car, so I would think they definately would help on a charger setup.
TECH Enthusiast
Joined: Jul 2008
Posts: 577
Likes: 1
From: League City, Tx
You'll probably see a gain on the dyno after tuning, you MAY see a gain at the track... I doubt you'll notice anything in the seat of the pants.... So if you're never gonna dyno the car to see where its at, and not going to run it at the track to benchmark it, I think you're wasting your money.... If anything, get rid of the single 3" Y pipe and go 3" duals... I'd do that for sure, regardless whether I changed headers.
1 3/4" headers on a 346@6800 is plenty, especially at only 14 psi of boost.. I mean you MAY gain 5-10rwhp but...i'd be surprised..
We just made 815rwhp on a buddy's C6 with 1 3/4" Breathless headers and 3" pipes (duals ofcourse). That was with a D1SC, 4" pulley and 8" balancer. 15 psi on a 402".
A pulley swap and a meth kit would net you WAY more gains and more seat of the pants gain for sure...and way cheaper.
***NOTE***
This is coming from someone with 2" ARH...
1 3/4" headers on a 346@6800 is plenty, especially at only 14 psi of boost.. I mean you MAY gain 5-10rwhp but...i'd be surprised..
We just made 815rwhp on a buddy's C6 with 1 3/4" Breathless headers and 3" pipes (duals ofcourse). That was with a D1SC, 4" pulley and 8" balancer. 15 psi on a 402".
A pulley swap and a meth kit would net you WAY more gains and more seat of the pants gain for sure...and way cheaper.
***NOTE***
This is coming from someone with 2" ARH...
Thread Starter
Joined: Nov 2001
Posts: 10,813
Likes: 15
From: Doylestown PA
You'll probably see a gain on the dyno after tuning, you MAY see a gain at the track... I doubt you'll notice anything in the seat of the pants.... So if you're never gonna dyno the car to see where its at, and not going to run it at the track to benchmark it, I think you're wasting your money.... If anything, get rid of the single 3" Y pipe and go 3" duals... I'd do that for sure, regardless whether I changed headers.
1 3/4" headers on a 346@6800 is plenty, especially at only 14 psi of boost.. I mean you MAY gain 5-10rwhp but...i'd be surprised..
We just made 815rwhp on a buddy's C6 with 1 3/4" Breathless headers and 3" pipes (duals ofcourse). That was with a D1SC, 4" pulley and 8" balancer. 15 psi on a 402".
A pulley swap and a meth kit would net you WAY more gains and more seat of the pants gain for sure...and way cheaper.
***NOTE***
This is coming from someone with 2" ARH...
1 3/4" headers on a 346@6800 is plenty, especially at only 14 psi of boost.. I mean you MAY gain 5-10rwhp but...i'd be surprised..
We just made 815rwhp on a buddy's C6 with 1 3/4" Breathless headers and 3" pipes (duals ofcourse). That was with a D1SC, 4" pulley and 8" balancer. 15 psi on a 402".
A pulley swap and a meth kit would net you WAY more gains and more seat of the pants gain for sure...and way cheaper.
***NOTE***
This is coming from someone with 2" ARH...
I think you would notice a gain once you go to a 3.40 pulley, but I doubt you would feel a difference at your current boost level. Bob
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
Personally I think the ypipe is more of a restriciton then the 1 3/4" long tubes. Would it be worth swapping? Thats up to you but as you know the more hp you make the less noticeable 10-15rwhp gets.
Joined: Jun 2013
Posts: 114
Likes: 0
From: Virginia - Where Rednecks and Presidents Come From
I'm new to the FI realm, and I may be thinking too general or old school on this, but isn't it always beneficial to "cross over" your exhaust flows at some point instead of coming straight out the headers and out?
I understand the whole aspect of the path of least resistance, but I've always heard a crossover, or Y pipe uses the Venturi principal advantageously to use flow to "pull" away exhaust gasses from the opposite bank.
Just curious how that plays in here?
I understand the whole aspect of the path of least resistance, but I've always heard a crossover, or Y pipe uses the Venturi principal advantageously to use flow to "pull" away exhaust gasses from the opposite bank.
Just curious how that plays in here?
TECH Enthusiast
Joined: Aug 2005
Posts: 672
Likes: 3
From: Washington Crossing, PA
I started to change my exhaust over. Just picked up a used 4inch mufflex and waiting to find a deal on some 1 7/8s headers. anything has to make more power then the crappy pacesetters and ypipe that's on the car now. I thought I read awhile ago that a supercharged car doesn't require a lot of back pressure, that you want as free flowing as possible.
Joined: Jun 2013
Posts: 114
Likes: 0
From: Virginia - Where Rednecks and Presidents Come From
I started to change my exhaust over. Just picked up a used 4inch mufflex and waiting to find a deal on some 1 7/8s headers. anything has to make more power then the crappy pacesetters and ypipe that's on the car now. I thought I read awhile ago that a supercharged car doesn't require a lot of back pressure, that you want as free flowing as possible.
You're gonna think I'm a liar, but about a year ago, I bought the 1-7/8" version of these headers for my 2000 SS off of Amazon for $399
Amazon.com: BBK 16940 1-3/4" Silver Ceramic Coated Full Length Header for GM LS-1 F-Body: Automotive Seems the price has went up - BIGTIME! But, I'll attest to their quality and fit. They look and work great! Sound awesome, too!
Might keep your eyes peeled on Amazon to see if they run a good deal like the one I got.
And, I thought I'd also mention...I'm usually not a fan of white cars, but yours look freakin' amazing! Awesome ride!
