I have the Corsa exhaust. Its a great exhaust, no drone whatsoever, pretty quiet too. It fit great and exits at the stock location. This is the exhaust the factory should have used!

If you read up on Corsa exhausts, their mufflers are all straight through and only have a couple 1" wide slots at either end that lead to a labrynth of chambers that are tuned to the engine. The muffler is very heavy because of this, but it works great.

The only bad thing I didn't like about the exhaust is the funky oval tip Corsa provides. I didn't use it and instead used an MBRP tip. The price isn't too great either... but I'd do it again in a heartbeat.

 

I have the 4" cat back Hushpower system. I just had it installed about a month ago and like it so far. It is about the same noise level at idle and cruising speed. It's just a bit louder while accelerating but it's not bad.

 

my truck was straight piped until i pulled a heavier trailer and the drone... OH MY GOD. so i stuck in a 51" donaldson muffler still have the cat on and theres no drone and i hear alot more turbo now

 

I'm running an MBRP 5'' turbo back straight. Had the muff on, but once I heard the same system without it, it had to go. Resonance is only present when you smash it. Once you hit cruising speeds its very quiet. Sounds amazing a idle.

 

4" pipe straight back from the turbo. then when i got in trouble for being to loud i added a mangaflo straight tru muffler. sounds great and i get lots of compliments about how it sounds mean and tough.