[rblong]

Thanks, I did some measuring last night and the primaries to the first flange are 2 inch, but then drop to like 1 3/4 inch from side pipe flange to collector. The collector is also only three inch and then the down turn down is 3 inch. Even though the side pipes are 4 inch, I suspect the primaries, collectors and turn down are restrictive. I am building my new pipes with 2 inch primaries, 4 inch collector, 4 inch side pipe with a bolony cut on the end so I will eliminate the restrictive turn down. This should eliminate any exhaust restriction. Everyone's input is really appreciated - I am learning a lot.

Bruce