What Rockman is suggesting is that the JP1 pipe and the stock Sportwerks HT (high torque) pipe is practically the same thing. Or at lease they target the same power range. With either of these used in conjunction with an 18 clutch bell will create an exciting restriction of both worlds. You will knock the crap out of the bottom end with the high gear.......and you will kill potential top end with the pipe restricting RPM’s on the other end. For an instant though, somewhere in the middle of the WOT acceleration it’ll pull real hard like that of a top fuel dragster...........then the gitty-up-and-go will have been gotten and that would be the end of that.

If you wanna free up some restrictions start with the header pipe (the “u” pipe). If you take it off and look into it, especially the end that connects closest to the engine, you’ll see a massive restriction. With a die-grinder, remove this restriction. Also, do not run any of the carb restrictors. The largest is 9 mm and the carbs bore is 10 mm. I took the time to bore one out to 11 mm. The theory was clear.........a nice smooth flow of air into the carb would be most beneficial. I spent a lot of time on that restrictor....boring...polishing.........turn out great. On the dyno though, it lived up to it’s name as a “restrictor” even though it was larger than the carb bore itself. By running an “open carb”, the gains were significant.