BTW If you do the rear sway you will be in the STX class, which means you can modify your air intake system. If you want to stay in stock class you can not modify your air intake system at all, you can replace the air filter with a K&N oem replacement. but you can not do a 'silencer delete'.
K &N Claims their intake kits are safe on your engine, and i've read in a few other places that the piping where the MAF sensor goes is 'close enough' to the stock size (maybe 2 mm larger). But everyone in the know tells me i should get a Tune , and that i'm probably running a bit too lean , if i notice any difference at all with my K&N.
which would mean a $200 kits requires $800+ for an ap and a tune.
Mike Suggested : Secrets of Solo racing , which finally showed up via amazon ! Its got a lot of great info . I'll be re-reading it a few times before the next autoX. (Thanks again mike)