bret i have one for my car and when it was completely stock it seems that it made it more responsive, but that was before i knew how to do things like advance ignition timing and so on. So if you don't want to ever lift the hood of your car then i say they make a small difference but if you want to get your hands a little dirty then you can easily out do the chip. I believe a MM&FF article did a dyno test on the hypertech powermodule and it gave them an increase of about 5.5 hp & 6 ft-lbs of torque. I still have my powermodule i will sell for $50 or so, if you still want it. It is for a 91 aod, i took it out several years ago.
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GT-40X(58cc)heads, cobra upper&lower, FMS 65mm TB, 75mm Bullet, 24# injectors, 190 lph fuel pump, moroso cold air intake, BBK 1 5/8 equal length headers, flowmaster cat back, 1.7 cobra rockers, crane 2031, T5Z gear box, centerforce dual friction, mcleod bullet proof bellhousing, 3.55 gears, hurst billet shifter with over 193,000 miles. thanks to all who contributed
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