I used a set of the older crimp style Magnaflow 14 inch long by 7 inch wide ovals with 3.0 inch side inlet with a perforated pipe exiting in the center. The muffs were mounted at the rear bumper and fed by 3.0 inch pipes off the 3.5 inch Hooker fenderwell A body headers, that car slowed down .03 ET in the 1/8 mile with them on and .2 MPH, 7.01 ET hooked up at 95.3 MPH, 6.98 ET at 95.5 MPH with the complete system removed
IHTHs
That car was a real hoot, not real loud at part throttle cruising but a lot louder at WOT
Best run with the exhaust system on in the1 /4 mile on Oregon pump swill was 9,994 ET at 134.6 MPH weighing 3450 Lbs. with me in it