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Yeah I agree, 2k is pretty high for an used kit, not to mention an incomplete kit. I have seen many used complete kits for 1,500 or so pop up so I definitely wouldn't spend much if any more then that depending on the set-up of course.
As for whether the you will need to modify an more of the fuel system I can't comment as I have not boosted a 420a yet, but on a completely stock fuel system (so exclude the FMU) I wouldn't even run 1 psi. The stock system is not something to boost on.
You will probably need a walbro 255, FMU/SFMU, injectors (turbo dsm injectors (450cc) will probably be fine.)
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Aaron
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