recommended exhaust

[gonebuggy]

2" tubing for the header? thats WAAAAY overkill.

1 1/2 is the biggest i'd recommend for your size motor. If you go to big then you loose some of the restriction needed for "scavenging".

Although a poor flowing exhast is a bad thing, one that flows too well is equally as bad.

how big are your exhast ports on your head? i bet that they are 1 1/2 or smaller?
For example if your exhaust ports where the flanges bolt up are 4 inches, why would you use a 6 inch exhasut pipe? You make no gains because the head opening will only allow so much to exit, and as i said earlier scavenging....

1 1/2 is perfect for that size motor. But that's just my opinion.

Alex