# B18c1 swap into 97 civic ex **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [August 25, 2008, 5:27pm UTC](https://forums.speedlife.net/t/b18c1-swap-into-97-civic-ex/199238 "2008-08-25T17:27:01Z")\ **Posts on this page:** 1\ **Showing post:** 35
**Author:** ![Heart4Audio](https://avatars.discourse-cdn.com/v4/letter/h/d9b06d/32.png) [@Heart4Audio](https://forums.speedlife.net/u/Heart4Audio)\ **Post date:** [October 15, 2008, 3:59pm UTC](https://forums.speedlife.net/t/b18c1-swap-into-97-civic-ex/199238/35 "2008-10-15T15:59:02Z")
> [@Politicis Section](https://forums.speedlife.net/t/politicis-section/38350/7): > > There’s truth in what the beef speaks. > > As far as throttle body size in concerned, assuming you’re dead set on going that route: The Skunk2/AEBS/whatever manifold you buy is going to be either 65 or 66mm opening, so at most you’d need something that is matched to that size. Buy larger and you’ll need to bore the IM and gasket and subsequently lose some power on your current setup…buy smaller and it won’t necessarily hurt you, some would even argue that having a slightly smaller (like .5mm-ish) TB than IM gives you a small anti-reversion effect ala Hytech. I don’t have any personal experience with the latter, but I wouldn’t do it on my motor. Either way, going after market is going to shift your powerband in the direction that is least useful on the street, and that’s no fun. You know I don’t speak spanish --- _[View the full topic](https://forums.speedlife.net/t/b18c1-swap-into-97-civic-ex/199238)._