I've seen it with the GMPP intake and FAST 90 once, the GMPP intake made about 15 more up top with an 850, but the FAST had a better curve and Average power, not sure how they would have been against each other at the track. I am also willing to bet the FAST is alot more efficient in a street or street/strip application, But I do love the feeling of big secondaries opening up on a 4 BBl
