Sorry this is late, but I'm in the same dilema. Remember bigger isn't always better. Bruce Hemminger runs high 9's w/a C&L 76mm & a 3" CAI. His car actually dynoed more hp w/the 3" vs the 3.5". I'm either gonna use the C&L 76mm or 80mm on my combo, just can't decide which CAI to get. Check out www.vossperformance.com Kyle is the guy to talk to. Really cool guy & can build u just about any custom pipe/color/diameter. I'll be giving him a call as soon as I can decide which meter to go with. Just my $.02-Nick