I just installed a set of Kooks 1 7/8" headers and ORY on my 2011 6.2L Sierra with the factory 3.5" cat-back exhaust. I'm getting a ton of rasp when accelerating and I need to eliminate it! On my 2002 WS.6, I added one or two bullet mufflers and it did the trick. What brand and size bullet mufflers is everyone using? Correct me if I'm wrong but isn't the factory 3.5" cat-back stainless steel. If so, I would also prefer a stainless steel bullet if possible. I assume the bullet should be installed right before the muffler.

 

I used a vibrant ultra quiet resonator, worked like a charm. I know it's more money than a bullet but it does a better job at getting rid of rasp. It's also stainless steel and comes in a 3.5in size.

I installed it right before my magnaflow muffler, had to get one after I did the offroad y-pipe. No cats makes for lots of rasp.

 

I have a 12" long bullet and it really helped cut down on the rasp I was getting around 3k rpm. It was the 3 1/2" diameter and I put it right before my magnaflow. Really nice and deep exhaust tone now.

 

I used the longest dynomax bullet they make. 18" case i think. It eliminated all rasp along with the redneck loud exhaust. That was with the silverado w a corsa muffler. Now i just run dual 3" with 2 long bullets with no rasp.

 

I used a Powerstick muffler. Straight through design and did exactly what it was supposed to do. Corsa sounds amazing with longtubes, cam, and no cats!

 

I run 12" bullets before my magnaflows and it got rid of all the rasp and really cleaned up the sound
my brother just put 18" bullets on his truck today before his blowmasters and he said it really tamed down the sound and cleaned it up

 

I've been extremely happy with my kooks bullet. I think mines the 14"