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#s seem a little low for those mods. Maybe, have the re-check everything. i totally feel you on loudness. i recently replaced my stock Npp with a magna flow npp axle back and have instant regret. So loud and the drone is insane. i think your best bet is going to be oem Npp. I know I'm going back to stock npp. i may look for a zl1 npp with the larger tips.
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