I was running a 2 1/4 dual exhaust on with my 502 and we switched to 3" dual and it made a HUGE difference. It was like she was happy to breathe. I do know that you should work out the compression problems first since there are back pressure to think about. Too much or too little it won't run right. Good luck.

Hello Kitty bandaides do make the hurt go away!!

1970 Chevy C-10 Longbed
1959 Chevy Suburban
1957 GMC Pickup Truck