I plan on having a custom exhaust made and I need some suggestions. I plan on a k04 in the future.

1. 3" or 2.5"?
2. What size race pipe?
3. What are the best muffler options? I am just looking for the sound to be a little louder than stock.

 

2.75" dont do 3" its too big. i would to a 2.5"dp to a 2.75" exhaust. i ran a straight through magniflow muffler. it was loud but gave great performance