Dom,
What are your performance goals/priorities? (Power/Handling/Efficiency/Weight/Etc.) Might help determine the most efficient way to reach it.
VAC Motorsports has stuff, Dinan has stuff, Supersprint, ESS, heck... there's a lot of stuff out there when ya dig for it. Right now really don't have enough info to be any more specific than a forum search would be. Welcome to the forum dude.