Rasp
Originally Posted by xaon
I'm not sure if this is an isolated incident or not. But when I replaced my old custom 3" ory-pipe on my longtubes out with a QTP dual cutout ory-pipe... it eliminated 95% of my rasp. This all through a wide open borla.
Originally Posted by MeentSS02
If you do some research, you'll find that people that have a y-pipe made with a merge collector will get rid of most of their rasp.
http://207.127.219.37/jethotymod.htm
even with the dual/dual, i had tons of rasp. it was so annoying. so i put an 18 inch bullet in, and there is no more rasp. but the exhaust is very quiet. i probably should have installed a 12 inch bullet instead of the 18.
Welp, sounds like another thing that is up for debate. There are people out there that actually like the GMMG with an ORY, just like there are people that swear up and down their grippy aftermarket clutch drives "just like stock." Man...rasp with a dual/dual. And that's a quiet *** exhaust (I used to have one).
11 Second Club
Joined: Feb 2003
Posts: 5,524
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From: The South
Originally Posted by 99Hugger
Not true at all. Only if your running it open.
Originally Posted by 99Hugger
Not true at all. Only if your running it open.
Nevertheless, a bullet in the I-pipe helps with sound absorbtion and rasp. If you add another one, it will absorb even more before the gases make it to the atmosphere. In fact, the longer the transition or string of bullets, the more sound waves it will absorb.
TECH Senior Member
Joined: Apr 2004
Posts: 6,157
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From: Texas
After hearing this the price of all the way back true duals doesnt seem that much. 7XX for gmmg and 11XX for true duals all the way back and you dont have to buy a y pipe. I think I will be going with the duals all the way back.
Originally Posted by 2MuchRiceMakesMeSick
After hearing this the price of all the way back true duals doesnt seem that much. 7XX for gmmg and 11XX for true duals all the way back and you dont have to buy a y pipe. I think I will be going with the duals all the way back.
Originally Posted by MeentSS02
If I'm not mistaken, the QTP ORY uses a nice merge collector (Flowmaster?) to bring the two pipes into one.
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Originally Posted by xaon
I've also found that to not be true as well. The y-pipe I had before my dual cutout QTP y-pipe was a cutom made 3" ORY with the same exact collector that QTP uses. It rasped like crazy.
I had the loudmouth previously 
Originally Posted by blkZ28spt
Exactly, if you don't put the solid block off plate in to run all through the muffler you get varying amounts of rasp, just like with loudmouth and even GMMG. I doubt many people with the borla run all the exhaust through the muffler.
My point was that the Borla is a good way to have the best of both worlds with your LT/ORP set up... nice loud rumble with no rasp, or the all out open header rasp.
Yeah, Im conviced any catback with an ory is gonna have some rasp. The quieter the catback less obnoxious and annoying the rasp is.
I think the rasp has something to do with the ypipe being unequal in length. This causes exhaust pulses to collide instead of alternating one after the other when going through the ycollector.
I think the rasp has something to do with the ypipe being unequal in length. This causes exhaust pulses to collide instead of alternating one after the other when going through the ycollector.
TECH Fanatic
Joined: Nov 2003
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From: The point of no return...
I was going to order GMMG for my car and while at the shop I decided on an electric cut-out instead. I like the sound better and can get it a bit quieter with the push of a button. A cut-out with headers and ORYP is deeper than any cat-back through a y-pipe I've ever heard in person or online. There is also a lot LESS rasp.
