First 4AG, big port, 3 rib. It's what came in my Corolla and my MR2 and what I'll be reverting back to in the Corolla for SCCA FSP regulations.themadscientist wrote:WTF is a blue top?
All bluetops had tvis, the red tops (higher comp, smaller runners, came in FWD Corolla's), which is what's in my car right now, didn't.themadscientist wrote:Ah, before the TVIS secondary butterfly thingie, right?