Sup everyone, The other day I installed an Erick's Racing 68-66mm TB on my fully built B18C1. I'm currently running a Skunk2 IM. I believe the opening on the IM is 64mm. I know it would have been ideal for me to get a TB that matched the opening of the intake manifold, but I really like the way the Erick's Racing one looks, and I was told that the 2mm difference won't hinder performance. I haven't got my car tuned yet so I can't tell if I gained anything yet. I do know that when I have my stock axle back on, and I engage vtec in 4th gear, I feel like I'm loosing mad power, like my power band completely drops off !! I was going up the 405N today in SoCali and I downshifted to 4th and when vtec kicked in, I jerked forward in my seat like if I had hit the brakes by accident!! When I have my full exhaust on, it feels better. I never had this problem when I had my stock TB on. Is it because I have the stock muffler on and the engine is sucking in more air that can be exhausted? Do I just need tuning? Is it because the TB is 2mm bigger than the intake manifold??? On a good note, it feels like the car has more power on the top end but just barely. If I am loosing midrange, will I be able to gain it back with good tuning??? If it helps, my mods are OEM P30 pistons (11:5ish) stock bore ARP rods/bolts Micropolished balanced crank Crower stage 3 cams P&P head Skunk2 IM I realize that I should probably have the intake manifold match ported to fit the TB, but can't afford the downtime. HELP!!