Dynomax stainless steel Ultraflows for RV duty are worth looking at.

I have had the 2.5” pipe size 34” long for 22 years now with a 16” long as an exhaust “tip.”

This created a slightly louder than stock “low rumble” system.

If I had to do it over I would add another 16 inch long SS Ultraflow right behind the catalytic converter and a 90 degree T stub near the rear bumper. I would start with T stub 48 inches long and keep shortening it until I got the best noise reduction at 1750 rpm.