If you are doing an SR20DET, that piping is fine. I have also heard that turbo cars cant have too big of exhausts either (within limits of course). Some Supra guys run 5 inch piping. Sounds like your putting quite a nice project together. Goodluck to ya.
NGK is the name of the game when it comes to spark plugs for Nissan. Just be sure you didnt buy platinum.
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