Interest Thread: AAM Competition 2.5" H-Pipe + Res Mid-pipe to shorties or stock rear

[370Z Purist]

Originally Posted by Flushnismo

oops just saw they were already posted lol I actually did have test pipes with the set up before and had to remove them within a week. Sounded like a freakin f1 car pulling up to a stop light while downshifting lol

Yeah, I downshift a lot... this is bad.

Originally Posted by Khoi@AAMComp

370zpurist

see now I'm curious to see what it will sound with a 2.5" h-pipe to 2.5" midpipe. as oppose to a 2.5" Y-pipe to stock midpipe

Although it will be more free flowing, thus louder, less exhaust turbulence may give you a better exhaust note

right now you are going from 2.5" test pipes, to assuming its a 2.5" y pipe which mates into 1 pipe, then splits back up into 2 pipes with your stock midpipe, which is what 2 1/4"? back out to 2.5" straight pipes, lots of turbulence to be had

Feel free to send me a prototype! At the moment I'll happily run the current set up but I'm leaning more and more towards LTH's. The only problem with that is the cost of the headers themselves, install time, plus uprev and a tune. That's around 900 + 400 to 800 + 700 + 300 to 700. (I think the tune might be a bit high). 2300 to 3100 dollars. That's a lot of cash. I might be able to get a decent tune for cheap, but those are with my friend's friends (almost all subaru guys) so I'm really at a loss there.

The turbulence is pretty terrible, yeah. The manifolds come out at 2.5 inch, the test pipes are straight 2.5 inch, then the y pipe brings the dual 2.5 to a 3 inch outlet, which drops at the flange to 2.5 inch (I think that's what the midpipe inlet is). I believe the midpipe outlet is the same size as the short tail pipe diameter as well. The most massive turbulence is at the midpipe, although if I change that to constant 3 inch section, the short tails won't match. That's why I'm pretty intent on seeing what you produce; a constant diameter through from the midpipe inlet to the tips. It's either that or I really have to change back to stock cats or go with a catback. I think another option is if I get long tubes and then buy the AAM catback. I can always get the catback and run that with the test pipes until I have cash for the long tubes and tune. I'll sell off my ypipe, but I will have some emotional trauma selling the short tails (if I even do).