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Originally Posted by Gator Bite
Perhaps the variables are different on your 996 and 986. On my 987, I did dyno testing before and after each of the three exhaust systems I installed. Each of them delivered about 15+ RWHP.
I changed the system more than 8 times, putting the stock exhaust back on between each install, in an attempt to cleanse my sonic pallette so I could best compare the new system to stock. The difference between the stock 987 exhaust and any of the aftermarket systems I tried was absolutely undeniable. In my experience, I didn't feel any difference down low, but from 5,000 up, the stock system just holds the car back. It's most noticable when you go back to stock after having driven the aftermarket for a while.
Believe me when I tell you, I'm not one of those guys that's going to tell you that my car felt so much faster after desnorking or performance air filter installation. I've tried those things and felt absolutely no difference. I'm a pessimist and it shows in my butt dyno.
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Gator Bite,
I concur with your assessment. However, in the case of my vehicle, there was marked improvement in low end torque "right out of the chaulks".