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Nothing wrong with a 603 but you're probably only going to see 300hp before you start breaking stuff, just my $.02
That being said, K&Ns don't filter as well as paaper elements, but if you're ok with dirt contamination then I'm not going to stop you (it's not my car)
You will need larger elements in the pump for more fuel. Usually around $1500, mail it to Dieselmenken or Myna out in finland.
If you want 500hp, find a turbo 606 (years 98-99 in the US)
You're on your own for a better exhaust manifold-I'd buy some 'weld els' and get welding. For a turbo there are a million options-I'd get the big pump first.
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