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Exhaust depends on how loud you want it and what look. For not VERY loud (i.e. not mine or Leon's ) go for ScoobySport (or Hayward & Scott) backbox and either a ScoobySport decat centre, or get a Magnex one at half the price (its just a straight-thru pipe, so who cares).
Then get yourself a nice PPP ECU (currently 2nd on my "big mod" to-do list, after wheels)