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1/4 10 1/4 super competition headers 3 2 1/4 race headers 88-94 pickups 350c ... #21603hkr competition super comp exhaust kits 2 1/2 maximum flow 14 2 1/2 10 ... 1/4 diesel exhaust systems mufflers 79-99 mustang # ... use as replacement on mustang cut off inlet/outlet pipes flush with stock mufflers ... welded to new muffler catback systems exhaust tips max flowtm sidepipe muffler ew n ... tested on a 1968 corvette with a 427 cu inch engine increased horsepower by 40 at a ... high-temperature black paint the inlet/outlet is a 2.5 perforated core in a 4 ...