a twin 2 1/4-inch system will handle up to 375 hp and 2 1/2-inch pipes are good to 450-plus. Of course for heavily modified engines larger-diameter pipes may be required, but keep in mind bigger ...

There are a number of formulas to help establish exhaust pipe size, but for an engine displacing 300 to 350 ci and producing 250 to 350 hp, 2-1/4 to 2-1/2-inch dual pipes work well. We went on the ...

Torque Tech offers additional pipe length that can be used to make up the difference, but we elected to construct these intermediate pipes out of 2-½-inch pipe that we picked up at the local ...