mine was orginally a na but I converted to turbo just changed the motor apparently alot is different cams, pistons most of which are made for forced induction which are also stronger also your gunna need a different fuel pump if ya gunna b running high boost, the na gearbox wont handle the torque neither the brakes which are alot smaller if you intent to stop and the diff is made for top end the turbo model is for better acceleration you's may think i dont know but ive been there!