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, BC3 cams/gears, CP XTP 9.2:1 pistons, NX DP-100 shot, 333's, N60, Prothane Mounts, ACT Xtreme/sprung 6 puck, Fidanza, PR WAI with JWT POP, 2.5" SSAC, Dynomax 3" muffler, Outlaw Intake Spacers, OEM wires, ngk plugs, UR Pulleys, Walbro 190, ST springs with KYB's, Kinetik KR912, Axis maglites
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