i'd do this induction kit cold air no panel filters they did fuck all
a fuel controller
a turbo timer
exhaust
headers
www.kalmar-union.com
and i'd also get their bodykit its nice
no BTCC spoiler tho
you can also change the spark plugs that might help a little cuz those bosch super 4's that they put on em suck arse nice idea high resistance get some newer ones cuz they are pretty but suck