[adamo]

Hello everybody I have a question if anyone wants to answer. I have a 69 gto. It has a 428 with 270+cfm 722 heads. It has a old faithful cam with Crower solid rollers. Has a sd performance real ram air IV cnc style ported intake. Max a lite connecting rods with je pistons. 10.5 compression. 4 speed M22w with 3.73 gears. The headers are 1 7/8” Indian adventures headers with 3.5” slip on collectors and a 3” exhaust with x pipe and dynomax ultra flow mufflers. Just wondering if changing to a 3” slip on collector would pick me up some torque? My thinking is first of all the exhaust slows down a bit in the large 3” collector them reduces abruptly to the 3” exhaust. Wouldn’t the stranger flow from the 3” collector to 3” pipes work better? Idk. The car works great but you know how it goes. Can never leave these cars alone.