Put in a cheap 18" straight-thru resonator in the midpipe. Will quiet it down and you wont lose any power. I like moroso spiral-flow pieces.

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2007 Sky Redline
Dejon 5027BB & Piping - RPI I/C - Magnaflow+Cutout
365 RWHP 351 RWTQ
2002 Honda RC-51 RVT