I own a 88 Pantera with a 96 suziki 440 l/c in it. Heres the problem. Out of the hole sometimes it takes off, and some times it bogs. And at about 65mph it bogs out with the tach reading 6.5 to 7. The original motor was a 440l/c and it would run 85 to 90. But heres the thing when I swapped motors I used my original pipe. Could that cause the problem Or could the problem be in the clutch. I know alot about motors, but in the area of clutches I am confused. Any help would be gladly appreciated. Thanks.