Originally Posted by Traxx822
Correct me if I am wrong but something as simple as running 25mph and pulling the throttle back to idle and just slowing down can add back pressure enough to cause damage.
I just blew out an exhaust gasket that was brand new couple weeks ago. If it wasn't from back pressure I don't know what could have caused it.
Jim is right, 2, 3"-4" exhaust outlets run into a 2 1/2" single outlet is going to be more restirctive.
I think if throttling back from slalom speeds 30-36 would cause head gasket problems - more members would be reporting problems.
Correct me if I am wrong... head gasket failures are almost always due to 3 things... overheat, defect in gasket, or improper installation.