My old pump gas Duster ran 10.00 a bunch of times at 134.6 MPH through the full length to the rear bumper 3.0 inch exhaust system with 2.0 primary pipes and 3.5 inch collectors shruggy
My 440 powered Dart picked up .84 ET and 8.3 MPH in the 1/4 mile by removing the 2.5 inch exhaust system with 2.5 inch Corviar turbo muffs from the headers to the side pipes exiting at the front of the rear tires work shruggy
Size can and does matter on exhaust systems when it comes to Hi Po applications that are sort of half fast shruggy
My next pump gas 3/4 fast street car will have either a 3.5 or 4.0 exhaust system on it with either 2 1/8 to 2 1/4 step headers or 2 1/4 primary pipes into the 4.0 inch collector up devil

Last edited by Cab_Burge; 10/10/18 02:05 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)