Originally posted by KingpinSVT:
I know Derek and I have very similar engine mods (well, had in his case ). You think the headers and altitude could have anything to do with it? I bet those headers can account for most of the MPG gains he saw and Im seeing. . . . .



Never thought about altitude affecting milage...hmm. It definately killed the hp, though.
There's no doubt that free flowing intake and exhaust pathways help with the milage. That was a huge "justifier" for many of my mods.

Derek Scion xB 5-spd Previous: 2000 Silver Frost SVT Please share the road with cyclists.