does the G8 have a TRUE DUAL exhaust or does it go to a Y pipe then split back out into duals?

so no one knows

True duals.

Doubtful.

See here http://www.surefloexhaust.com.au/ve.htm I don't see a y pipe.

No matter what the factory system is a good aftermarket system will still release a few extra HP and give it a beter sound. IMO

See here http://www.surefloexhaust.com.au/ve.htm I don't see a y pipe.

Your link is to an article with a bunch of pictures, none of which is identified. Which is the stock system?

I can almost guarantee you that there is an x-pipe somewhere, even if it is inside of a muffler. If there isn't, then the engineers aren't too bright. This means that they have forgone scavenging which helps vehicle performance.

Your link is to an article with a bunch of pictures, none of which is identified. Which is the stock system?

I can almost guarantee you that there is an x-pipe somewhere, even if it is inside of a muffler. If there isn't, then the engineers aren't too bright. This means that they have forgone scavenging which helps vehicle performance.

The ones right under the dyno sheets are the stock system.

The ones right under the dyno sheets are the stock system.

If that's the case then there is certainly an x inside of the muffler.

My 04 GTO was true dual. There maybe some connection inside the 2 in 2 out middle resonator. I think someone cut open one for a GTO here http://www.ls2gto.com/forums/showthread.php?t=114481&highlight=resonator+cut+open

i dont care if its an X or an H, as long as its true dual. for soem reason Y pipes bug me lol

True duals.

I looked under the car at the buffalo autoshow. I was just peeking under and the rep goes "it's true dual exhaust" I joked that I must not have been the first guy to do that. She smiled and said "no".

sweet. did you happen to see tyhe crossover? is it an H or X. or is like a prochamber?

I could only see from the cats back. Didn't really look that closely.

True duals means that output from one side of the header manifold never touches output from the other side. It is highly unlikely that the G8 (or any new vehicle for that matter) has true duals from the factory.

O4 GTO true dual. The little h you see connecting them, is just to keep the pipes apart. There is no connection from left to right. http://images.google.com/imgres?imgurl=http://images.highperformancepontiac.com/tech/0409pon_spintech_04_z.jpg&imgrefurl=http://www.highperformancepontiac.com/tech/0409pon_spintech/photo_02.html&h=480&w=640&sz=87&hl=en&start=3&um=1&tbnid=PbhIlRI0-nucYM:&tbnh=103&tbnw=137&prev=/images%3Fq%3D04%2Bgto%2Bexhaust%26um%3D1%26hl%3Den %26sa%3DN

True duals means that output from one side of the header manifold never touches output from the other side. It is highly unlikely that the G8 (or any new vehicle for that matter) has true duals from the factory.

are you saying that that there would be no cross over pipe like an H or X in that definition? if so yea your correct and id agree with that. what i meant by true duals was no Y pipe. either an H or X is dual exhaust to me. Thats the thing that pissed me off about the Camaros and Trans Ams was that they had y pipes and their exhaust split back into dual outlets

are you saying that that there would be no cross over pipe like an H or X in that definition? if so yea your correct and id agree with that. what i meant by true duals was no Y pipe. either an H or X is dual exhaust to me. Thats the thing that pissed me off about the Camaros and Trans Ams was that they had y pipes and their exhaust split back into dual outlets

"True duals" means that an exhaust bank leaving the head on one side exits the vehicle without ever touching the the exhaust gas from the other bank.

True duals, while considered 'cool' and rampant on old SBC vehicles in the 70's, forgoes the performance advantage of exhaust gas scavenging.

Scavenging is where negative pressure from one exhaust bank assists the other positive pressured bank by 'pulling' out gasses from the positive bank.

True duals, while 'cool' (perhaps), is actually a much less effective setup than an exhaust system with a properly engineered x-pipe placed for maximum scavenging.

"True duals" means that an exhaust bank leaving the head on one side exits the vehicle without ever touching the the exhaust gas from the other bank.

True duals, while considered 'cool' and rampant on old SBC vehicles in the 70's, forgoes the performance advantage of exhaust gas scavenging.

Scavenging is where negative pressure from one exhaust bank assists the other positive pressured bank by 'pulling' out gasses from the positive bank.

True duals, while 'cool' (perhaps), is actually a much less effective setup than an exhaust system with a properly engineered x-pipe placed for maximum scavenging.


I agree totally. I swear the only reason they did it was cause of the sound. Flip sound give me more horsepower. Maybe they did so it would be easier for aftermarket exhaust manufactures to gain 5 -10 horsepower easily.

yep that would be true duals, i should have rephrased it as does it have dual exhaust.

and IMO H pipes > Xpipes just personal prefrence

As far as true dual I guess I'd also have to assume no. But I was comparing my y pipe exhaust on my "dual" exhaust grand prix which has a single cat.

The g8 has 2 cats. And the lady told me it was true dual. Dual from the headers? I'm not sure...

This might help. C&D article states 2 to 1 to 2 to 4(dual tips).

And this image is off of ********************.com

***********************.com/ebaystuff/gregs/G8Exhaust.jpg

Guys, the GTO was true dual in all years. The pipe between the '04's pipes was for support but was blocked off completely. The resonator in the '05/'06 had NO exhaust crossover between the two sides. I would guess that the resonator on the G8 is the same way with no mixing between banks.

That said, putting an H-pipe on the '05/'06 GTO was shown to give NO performance advantage over stock, all it did was change the sound. Exhaust scavenging is great if you need it, but if you engineer the flow rate of the exhaust well enough it's not necessary. Basically you just end up with 2 4-cylinder exhaust systems.

The G8 may have a crossover in the resonator, but even if it doesn't there probably won't be much of a gain in putting in an X or H-pipe. Other than better sound by eliminating the resonator.

True duals means that output from one side of the header manifold never touches output from the other side. It is highly unlikely that the G8 (or any new vehicle for that matter) has true duals from the factory.

Funny, our GTO's did!

See this picture. Usually you can see markings (or outlines) on the outside case of a muffler, resonator, etc, where internal welds have been made. In the case of this resonator (the first piece in this picture) I do not see weld points, therefore it looks like this resonator is nothing more than perforated straight pipes through the case, utilizing whatever material the resonator manufacturer filled it with to quell noise. That means, this is a true dual setup.

http://i26.photobucket.com/albums/c127/snafuoz/VESSVfrontexhresized.jpg

Many dual-in/dual-out mufflers have a built-in X-pipes.