I asked Sage a question similar to yours and this is what he had to say. I hope this will help you out.
So, first off the fit & finish of the PC is hands down the best of the systems, the FMF looks nice, the PC looks better, the PC fit, the FMF took some work....
-Tests are done on a highly modified 99 KDX 220-
FMF torque - good low end, ok mid, no top, peak is between low & mid rpm range
FMF rev - slightly less low end, strong mid, good top, lots of over rev, peak is a bit flat but very wide
PC - slightly less low end power than rev, very strong mid, strong top end power, slightly less over rev than the FMF rev but peak power feels much higher than the flatter peak of the FMF rev.
All in all the FMF torque is out of the question for a rider above the novice level, for a very slow, non aggressive new rider the torque pipe would be for you. The FMF rev is a good all a round pipe for faster woods riding and racing, the peak power is down a bit so in a all out drag race you may fall back to the guy using the PC that knows how to shift right. The PC is better suited for the aggressive faster rider that doesn't get lazy and knows how to keep the bike in its slightly narrower power band. The type of rider that would like the PC pipe would be the fast guy with the big carb and purpose built engine and a "Take no prisoners" attitude.
After using all 3 systems I feel that the best one for me is the PC, I ride my KDX more like a 125 and very rarely use the low end, I'm looking for mid, top & peak power. I used the FMF rev for quite a while and admire the fact that if you get lazy it will allow that, it will pull itself back from the "lazy" zone with very little to no clutch, it has a nice flat power curve where the PC has a very noticeable sweet spot of rapid acceleration. As for the FMF torque, its not for me, the power is not where I need it to be, its good for tooling around in the pit or down a slow trail but if you want to ride aggressively the option is not there.
For race or trail use above the intermediate level I would suggest the PC.
For race or trail use below the intermediate level I would suggest the FMF rev.
For a new rider or a rider that never gets past 1/2 throttle I would recommend the FMF torque
Talk to you tuesday, Sage
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