ok Was thinking maybe my exhaust might be restricting the motor too much, so I was thinking bout getting exhaust dumps. A couple guys up here said on the older motors that the open header help proformance a ton. An was figuring if I ran a y pipe in to the cutout then there would be no restriction at all I beleve I got a 2 1/2 inch or 3 in exhaust but it goes 2 in to one. was thinking the open header would free up the restriction.