If you havent already fitted a good set of extractors and free flowing exhaust Do this first as any mods to the engine will not make any difference while running the standard exhaust system , From there fit cold air induction , larger T/B and AFM , That's about it for bolt on's .
Best bang for bucks would be a set of pacemaker extractors and exhaust and then a set of 3.7 gears for manual, or 3.9's for an auto. Next step after that would be heads, intake (if you have the series 1), MAF, injectors, cam etc $$$$$$$
If you already have the exhaust, then $2000 will buy you a set of GT40P heads ($1000) and a matching cam ($600) and roller rockers ($400). The stock MAF will hold you back a little, but you can add the MAF down the track along with a set of 24lb injectors. As Hales said, Mick Webb is a great guy to talk to, gve him a call.
If you went for the GT40P heads, YT roller rockers and a good cam, either crane 2031 or crow medium performance cam, you should be looking at around 200-220 kw I would think. With MAF and throttle body you will push that up to around 240kw
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