With my mods at 5k feet, CPI, k&n in box no lid, +4 timing, and boysen reeds.. I'm at 270 main and shee loves it.. Took me a while to get there, but that's perfect. Had 290 and 280.. Sti was not right. Finally stepped to 270 and it's great Spring-summer, winter I put airbox lid on and it's still good.