hmmm very interesting

anything to do with exhaust gas speed leaving the head? maybe 4age has better exhaust port flow than sr20....although the cam would help with this alot i would imagine.

so by running the .64 housing instead you will be sort of limiting the exhaust gas that hits the exhaust wheel at once? i mean with the .86 housing, it allows more gas in the same area due to the larger housing?

im not exactly upto date with housing sizes and outcomes....i know a bit....but yeah....