MAC PRO CHAMBER H-PIPE 3 auto (long tube headers) 1979-1993*79-85 requires double hump crossmember for dual exhaust installaion.
*The Pro-Chamber h-pipes go even further than traditional h-pipes to produce more torque & horsepower by merging exhaust pulses in one area. Merging all exhaust gasses creates highter temps, which creates a boost in exhaust velocity, plus forcing exhaust gas to see both outlets. These h-pipes are aluminized.
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