Simple Ls1 mods
http://www.installuniversity.com/
Good start there
As mentioned, lid, porting your throttle body, catback exhaust, lca's for handling ($200), cutting up the EGR, shift skip, if it's a 6 speed you can do the drill mod for consistent shifting, find a friend with HPTuners (with a 98 license) and do some quick hits to maximize tuning (helps even when stock).
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