Rling6.24x4

If you keep the 3rd cat any muffler will be pretty quiet. Get rid of it and then it's completely different. I'm running 4X9 casing 18 inch and it sounds good and fine on the highway.

Just got a magnaflow 18 inch 4x8 casing 3 inch in /out with 3rd cat delete and silencer delete. Exhaust looks stock now but sounds good and mellow.

Just talked to Corsa and the new exhaust should be ready at the end of April and will be 3.5 inches and possibly 3rd cat delete. I've had my truck for a week and have put 500 miles on it through highway and farm land. This exhaust I am highly disappointed in it. My 2010 Denali had alot nicer rumble stock. 3 cats and a muffler and silencer is a little much on a exhaust system.