Noise levels rely more on muffler choice etc. Piping size doesn't make as much of a difference. ACTUALLY on my car when I moved up in piping size it got quiter. That was until I went to the 3" turndown anway.
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93 NX2000-7.75@92mph
http://www.youtube.com/watch?v=FwPc5mqL1m0
5SPD SWAP, 2120lbs. JDM Motor, Calumsult Realtime ECU, Brian Crower STG 3 cams/adj gears, CP XTP 9.2:1 pistons, NX DP-100 shot, Prothane Mounts, ACT Xtreme/sprung 6 puck, Fidanza fly, PR WAI with JWT POP, 2.5" SSAC, Dynomax 3" muffler, Outlaw Intake Spacers, OEM wires with ngk plugs, UR Pulleys, Walbro 190, ST springs with KYB's, Kinetik KR912, Axis maglites
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