Personally I'd do 3' downpipe +cat if money tight or full system if you have $, a retune to suit, then intercooler and then you'll probably want to spend money on not sliding off the road (dampers, bars, springs). You can waste a lot of money on plugs, DV's, silicon pipes, overrated CAI's - its all diminishing returns type expenditure really. Do the big stuff first.
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