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major high hp car(skyline,supra,honda drag car) make a lot of hp with 3" piping. 300zx dont need 5" (2x2.5") piping for make hp.I really think 4 inchs(2x2") is more than enought. Supra and skyline can make over 1800hp with 3" piping. My friend make 989 rwhp with single 3" piping on Supra and other make over 650whp on 1.8 gsr engine in civic car. Show me one 300zx dyno sheet with 2" vs 2.5" piping with no other modification and after this, I maybe change my mind. All seller said yes,They make big differance but no can show me the true differance. Sorry for my english
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