I got my off-road H-pipe and headers at the same time, so I was really in for a treat. My car was MUCH louder and throatier. I noticed a significant hp increase in the higher rpms, but I did also notice a small loss in low-end torque due to the fact that I have an AOD and I was running the stock gears at the time. Once I had my 3.73's installed... Problem solved.
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1991 Mustang GT Conv: 58,000 original miles, 2nd owner.
Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai.
Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock.
Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers.
Chassis/suspension/brakes: Kenny Brown supersubs.
The rest is stock.
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