-----------------3" exhaust, MINIMUM ! If you`ve ever done an A B A test on exhaust, you wouldn`t even run tailpipes! I have 3.5" dumped on my stroker, built my own mufflers. no drone no exhaust in the cab .
I would love to do 3" but I do a lot of highway driving and im worried about the extra cab noise. I would really like to ride in a car with 3" for a comparison.