best exhaust for an S/C?
 

I know this is all in theory, GTM and stillen will eventually come out and give us the real info. Thus far I've installed GTM test pipes, other than the smell I love them no CEL thus far.

A lot of exhausts out there run different kinds of plumbing, we have thus far seen x-pipes, y pipes, and true duals. Which one do you think would work best for a supercharger setup? I know it would be a 2.5in but wondering what kind of plumbing you guys would run.

True Duals all day baby, baby!

that means everyone who bought a system with an x pipe such as berk or a y pipe will be leaving out a few HP if they go F.I.

I'm not sure there would be much of a difference between a H,X,Y pipe design but I could very well be horribly wrong...

I figure if the difference in designs has been so minimal with NA setups then so long as pipe diameters remain 2.5, a SC shouldn't be that huge an addition to the equation and thus change the results drastically. But maybe the higher volume of gas might start to bring the mid-pipe designs into the equation more...


I guess I'd like to see the answer to this as well.. ahha :D

H or X pipe will offer the best flow for a FI setup, You dont want to be narrowing down the flow route from 2-1 Y pipe.



DAN

On the Stillen, the diameter of the single portion of the Y is greater than the diameter of each of the inserting pipes. In terms of area, a single 3" pipe has more cross-sectional area than two 2" pipes. So flow is better with the single 3" pipe. With the Stillen design, the only factor that could potentially 'hurt' your power would be turbulence going from 2 pipes to 1 pipe and then back to 2 pipes. Hard to really quantify that effect though.

anyone know who is putting out midpipes other than HKS?

I'm pretty sure Stillen will be building their setup with their own exhaust, standard 2.5" diameter will do. I doubt the hp difference between 2.5" setups will be noticeable. Unless its a nismo, then you might lose power:icon17:

both SCs will work with all aftermarket CBEs out so far.

I know they will work, the question asked was what kind of plumbing would work better.

I think all would only differ by a few hp at the most, and after paying big bucks for the FI I dont think its worth the extra money to make up a few hp when you are already getting bug numbers from the fi.

Our true dual was meant for Forced Induction.

I think you'll be splitting hairs trying to figure out which works better. On these cars X & H pipes are mostly for sound.

Back when I had my Mustang, we had to run a crossover to balance the exhaust pulses due to the firing order of the engine. X pipes tended to make a little bit more power than H pipes, but it was only just.

Wha? Nonsense!

Also, I have noticed you have made some anti-Y pipe comments in other threads... there really isn't anything wrong with a Y-pipe on these cars, either. As long as both pipes coming off the headers collect into a large enough single pipe at the Y, you're fine.

There are a lot of TT cars that run Y pipes into a single exit exhaust. Heck, all of the LS1 Firebirds/Camaros came from the factory with a Y pipe.

"anti y pipe" that is a funny way to put it. I do feel that out of the H,X, or Y configuration if they are all equal diameters the Y would be the most restrictive. However it is also a popular configuration used by fujitsobo, powerhouse amuse, and gthaus to name a few. I worked on Mustangs for years as well. Started with a 2000 v6 later onto a 2004 GT I ran short headers, o/r X, and a magnaflow catback, while many here would say it's loud to me it was sublime. I guess when it comes to the Z application its on personal preference.

That's the exact same setup I had on my '03 GT! VRS O/R X and Magnaflow CBE... OMG, loved it!

YouTube - 2003 Mustang GT Magnaflow Exhaust

The reason why I asked this question in the first place is because I love the GTHaus exhaust and I ordered the rear section after seeing it on youtube but I really don't know what to think about their y pipe configuration. They state that they actually lost significant power running true duals.

Btw the mustang guy in me couldn't deal with the restrictive cats, I just put on test pipes on Friday and I've been grinning since. Quite an upgrade compared to what I put on the GT since no check engine light goes on.

How often do you have to put the stock cats on for emissions testing in NY? Here in CT, every 2 years.

I don't think they use the exhaust snorkel anymore, some shops check for a cel and run an obII test, if it comes clean you should be good to go. Plus, if you go to the right shop $50 will get you a free sticker.

Will the GTHaus rear section bolt up to any non-GTHaus configurations?

I don't know if the Mid-pipe and rear sections are modular like they were in the Mustang. I ask because it looks like the rear section of the GTHaus bolts to the mid-pipe much farther back than my Fast Intentions exhaust does.

:eekdance:

How would it pass a test with no cats? Dubious shops excluded of course.

You could always weld the factory shields from the stock cats around the test pipes to help with visual inspections (I'm pretty sure everyone does a visual).

With my VRS X pipe I bought two cheap cats, gutted them, and JB welded them around the X pipe... it looked like it was a catted X pipe and the welds actually held up for quite a while. :icon18:

because it won't throw any trouble codes, GTM test pipes have an L-stem and keeps the O2 sensor away from the main flow. I've had it for about 200 miles no issues

John at GTHaus didn't seem worried, only thing he advised me of was that it won't be as loud as the youtube video since I'm running stock plumbing. Hopefully they get on here as a vendor and chime in soon. Worst part, they already sold their first 30 sets I have to wait 4-6 weeks.

In the meantime I'm shooting for an os giken clutch/fly and finish the carbon work, doors should be here next week.