titter

iTrader: (5)

I finally got around to getting my headers installed last weekend. It sounds great, minus that nasty rasp around 2,500rpm at part throttle. I am thinking of two ways of fixing this, going to a 4" setup with the FM merge, or just sticking a bullet after the Y. What would you suggest, or what have you found to fix this?

conor.davis

iTrader: (20)

If it were me I'd go with the flowmaster merge first, then go from there if your still not happy.

Shockwave179

iTrader: (7)

I don't think putting the bigger merge in there will do anything to help the rasp. You are probably better off with a small bullet muffler or getting a y-pipe with cats.

rob69zombie

iTrader: (7)

I like the little bite @ 2500 your setup has. My buddy had that setup on his SS and it was awesome, just too quiet.

libertyforall1776

iTrader: (2)

Well that sucks, would I likely get that same rasp at those RPMs on my Dual-Dual with Kooks Headers & ORY? (still haven't fully decided on which Headers/Y yet) I too would like to know why the rasp is happening...

Are there any Headers & ORYs that do NOT give that rasp with the Dual-Dual system without adding a bullet muffler?

rob69zombie

iTrader: (7)

Simply answered; no. If you have LT's, an ORY, and pretty much any cat-back you will most-likely have some rasp.

libertyforall1776

iTrader: (2)

Assuming that's true, what's a better sound and is there a performance difference doing a catted Y vs. just adding a bullet muffler?

Does the bullet with an ORY get rid of all the rasp? What bullet recommended?

NBM99SS

iTrader: (33)

Put some cats on it if you want no rasp

djfury05

iTrader: (30)

I have no rasp.. with your favorite exhaust too lol.. magnaflow.. only rasp I have is I think when I rev it high with cutout closed.. I'm not even sure if its rasp?

rob69zombie

iTrader: (7)

You have some rasp Jesse, lol. Not like a LM1 but there is some. Did you have your cutout open or closed at the track? I have the vid of us racing and I can't really hear my LT's, ORY, and GMMG over yours it was so loud.

djfury05

iTrader: (30)

I think your mistaking that sound for pure sex rather than rasp lol.. I had the cutout open at the track.. when it is closed it is a huge difference in sound with the Magnaflow

titter

iTrader: (5)

No thanks. It really isn't raspy, its more of a resonating sound at 2,500rpm at part throttle I want to debunk. At WOT it sounds excellent. I am going to throw a bullet on it when I get back to a lift, and hold off on the rest until I see how it changes. I will get some sound clips to show the difference as well. If this doesn't solve it, will just go to a 4" setup.

1979rs/z28

iTrader: (21)

I had almost no rasp with my dual dual and pacesetter lt's and y.
It was just really quiet

titter

iTrader: (5)

I am thinking it has more to due with the auto and where the revs sit during part throttle versus a six speed. A converter will put it past the annoying resonating point. Ordered a bullet today, and will get it on this weekend.