as far as the crash bar is concerned, yes, you can keep it on (and you probbaly should for the extra safety) but you have to modify its corners to fit the vr4 bumpers over it. If you Search the forums there's pics and information on modifying the crashbar floating around here somewhere.
as far as the intercooler question is cocerned; i'm not sure so i'll let someone who's already boosted answer that.
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