I will repost when I  drf files, these were sent Jpeg, again the engine was large reed 87, bore 87m, reed Vforce 2, carb 42mm, 1990s porting, compression 165, gearing 14/44, tires 20", fuel VP12 mixed @ 30 to 1 w/927, no airbox 9" K&N filter, We pulled an average of 65 HP and 50 ft lbs of torque on a low compression engine, No smoke and mirrors, No Butt Dynos, Just Time and refining to get a good all around pipe made.  FYI Dale Fry and I used Bennis Dyno and know the numbers are real from our last testing a while back. Now here is some jetting information on this pipe using Mukuni 42 , we went from a R-4 to R-3 Needle Jet, OEM needle  3rd clip, 35 pilot, 330 main, our  dyno runs on 04-02-14 had the stock needle jet (R-4) 45 pilot and 440 main which peeked at 62 to 63 HP.

Mitch is the change in power after the peak due to using a main jet that is 11 sizes smaller or due to a change made to the pipe???