by using turndowns you are going to lose a little bit of that low end grunt, but it shouldn't be as bad as you are describing. i ran turndowns on my car for awhile and it really didn't feel any different as for as power, but my car had heads, intake, and so on. So i guess the more stock your car is, the more it could hurt it by not having enough backpressure.
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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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