I just put high compression domes in my vitos head and k&n filter with the lid off i put the kit in and it freakin rips!!! with .040 over power pistons! But the problem is that it seemed as if i was still to lean on top with 300 mains because it kinda pops like its kinda lean or its running out of fuel. i drilled my mains out to 5/64ths of an inch and it kinda helped now the plugs dont look quite so lean actually they look perfect, but it still does it a little only at full throttle. one of my theorys is that now with all the flow my carbs are too small, its sucking the fuel so fast they cant keep up has anyone ever heard of this?