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not much...fuel system,fmic,exhaust,some kind of tuning device and a bov that desnt leak.Then you can save some green and buy some other goodies.I don't think you'll have problems spooling, a 50 trim is not that big.Now my 68 Trim is huge, I'm still trying to figure out what to do to spool that thing faster, it's dbbbut that will help only a little.I'm prob. gonna end up selling it
that's not true. the s2 is just as good as a s1 to tune/mod with. the s3 ecu hasn't really been tested in that way simply because it's too expensive and not seen on its own, but there's no reason to think that it wouldn't be as mod-friendly as the other two stages.