Originally Posted by R-3350

been running opened up PC's for a while but also a 8mm M pump and a HE221w so no comparison with standard and modified. i did have them in before the pump swap but i had a ported head and 221w by then so im not sure how much of the gain was them and how much was everything else. if i ever get the time i may go do some dyno runs at a shop near me. it would be interesting to try a few different things and see some actual number changes.