I agree that it's a trial and error type of testing system. Everyone's hearing, feeling, and tastes are different as are exhaust systems. I am on my 3rd exhaust system on my Inliner. I just tried and re-tried until I got what I wanted. I did not want it to sound like everyone else so (as old blue eyes said) I did it my way. I believe that a cross over will quiet down a system no matter what size pipes you have. Any time you scavenge 2 into one, it will quiet it down. I ended up with 2.5" tubing, 18"x3" chambered mufflers(just a crimped piece of pipe ala corvette side pipe mufflers)and a 5"x12" tips.
The tips added 20% more rumble to the system!No lie! I just put new valve seals in my car last winter and it actually quieted down the system about 15%! So by tightening up the valve system, it can change the output sound of the exhaust. So basically, "tune" your system the way you want. There are so many variables it would be very difficult to give you a list and say do this and that and you'll love it. Each vehicle is different so make your system match your car.
Finally, if you are at a lost and are not sure what to do, try a system and live with it for a year. It can always be changed.
RapRap
1940 ChoppedChevyCoupe
