i have a 04' xcsb 2wd.5.3 , comp cam, e fans, nelson tune. cai, pacesetter LT's , y pipe no cats. i have 3'' ran from y pipe into 40 series flowmaster with dual 2.25" outlet dumped in front of axle. i love the sound until it hits 3000rpm then the sound totally changes to what is a hard to describe sound but to me it seems alot higher pitched maybe a raspy sound. i have heard almost all ls1 motors do this with no cats and headers. is there another muffler i can run and keep the flowmaster sound without the change @ 3000rpm? or is there a trick to solve this with what i have? i read the post on exhaust drone and adding a capped off pipe on the side. is the sound im hearing considered drone? thanks in advance for the help.

 

I use a 3 1/2 Walker RV muffler on mine. Sounds awsome

 

I never got the idea of adding a J bend into the pipes, any who get an exhaust resonator and weld it after the muffler it will take all the drone.

 

heres a take off of my truck...?

2011-11-18_09-16-46_798.mp4 video by darnie1987 - Photobucket

 

Get rid of your BaffleMaster and get borla or magnaflow.

 

Ive had the best luck with my corsa sport so far, nothing i had before compares

 

A small Dynomax just behind the y-pipe. Will fix it up just perfect.

 

That sounds like my cherry bombs. 3-5k is really loud! I'll be ordering some magnaflows when I find the cash.
I'm tired of having to shut it down at the bank and taco hell.