bgray

iTrader: (2)

On m rcsb it had a h/c lq9 and arh 1 7/8 lts, pry and a corsa muffler. On normal acceleration and wot it sounds great. But mid throttle it's crazy raspy. Sounds like a redneck straight piped ahit box.

With my xr1 it did the same thing too
If I open my electric cutout, the rasp is still there...

Is it the lack of cats causing the issue?

Add 2 high flows?

Thanks everyone

terravast4

iTrader: (25)

yes, no cats adds more rasp

GMCtrk

iTrader: (27)

The lack of cats is confounding the problem, however I had ARH 1 7/8 with catted Y pipe and Corsa touring catback and still had some rasp at WOT.

FFDP

iTrader: (2)

Add a resonator.

TXsilverado

iTrader: (19)

add a dynomax bullet to your I pipe. problem solved.

bgray

iTrader: (2)

Txsilverado, sounds like you speak from experience?

George C....

if you understood exhaust design you would see why exhausts have rasp


any y pipe setup has rasp its just how much will you tolerate or cover up with muffler design

with said my truck has a 2.5'' y pipe into a 4" exhaust with a ultraflow muffler...raspy as all hell

added nothing more then a flowmaster and the amount of rasp went away

if you were able to have a true dual exhaust with exhaust tubing being identical like a new camaro or mustang or corvette the exhaust design takes away from the rasp

so for you OP you need to slow down the pulses enough to fix the rasp

TXsilverado

iTrader: (19)

Yep. Longtubes with ory and corsa sport was raspy as ****! Added a bullet and fixed the problem. It did quieten down but corsa w longtubes and ory is way too loud anyways.

06 4.8

iTrader: (5)

Get rid of the Y pipe and run true duals. I had a Y pipe setup on my cammed lq9 setup and it was raspy, had the Y pipe cut, installed X pipe and 2 magnaflows and it just has a deep tone and no rasp.
Same scenario with my old TBSS

bgray

iTrader: (2)

Unfortunately I don't have much room to run duals and a x pipe, trucks 5/8 drop, single 3" is all the room I have with the bed supports cut.

Imma try a dynamat bullet, see how that works