I just did my own port and I cannot believe the difference. No dyno or anything but the car drives so much better now. I have a K&N filter, 160 thermo, Flowamster (soon to be true duals) catback, free ram air, and after I did this mod I roasted the back tires from a 2500 spm roll on to redline. I never thought it would be that big a difference but I ported it good and polished the shit out of it. Def great free mod.