The Alchemist

iTrader: (19)

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?

Staleyp

iTrader: (4)

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?

sheikss

iTrader: (11)

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.

Blackpanther99

iTrader: (8)

I dont see how going to 1 7/8 headers wont make any good gains. If you can ceramic coat them then do it.

The Alchemist

iTrader: (19)

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.

Blackpanther99

iTrader: (8)

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.

Tally TransAm

iTrader: (17)

allout06

iTrader: (11)

what about kooks true duals instead of a Y pipe set up + 1 7/8". i would think youd gain the most that way. but thatd be a very salty setup.

Blackpanther99

iTrader: (8)

Its a interesting idea though^ Aside from performance it should sound amazing.

The Alchemist

iTrader: (19)

Yeah, I've thought about the Kooks true dual setup, but I want to keep the overall volume under control, so I'm not sure that would be ideal.

kinglt-1

iTrader: (26)

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.

ajrothm

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...

The Alchemist

iTrader: (19)

I hear your points, and forgot to mention that I have an Aquamist water/meth injection system already. I also have a 3.40" pulley waiting to be installed, but I need to address fueling issues first, namely running a new feed line and putting in a boost referenced regulator.

Bob@BruteSpeed

iTrader: (16)

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

I8UR4RD

iTrader: (16)

when ya gunna stop bein a dyno **** B $?

itsslow98

iTrader: (18)

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.

ss2000silverbullet

iTrader: (12)

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?

stealth355tpi

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.

ss2000silverbullet

iTrader: (12)

Oh, I hadn't heard that. Good to know...
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


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!

speedfreak2685

iTrader: (12)

FWIW I see 180 kpa with a 4.25 blower pulley at 6500 rpm. stock motor/heads with a cam. 1 7/8" TSP longtubes and TSP true duals. Car made 638/538 on a dynojet and traps 102-103 in the 1/8th