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L99 or LS3?
Going with cats would have helped a bit for sure. I would suggest installing a Magnaflow Resonated X-pipe to start. They are cheap($100), and significantly reduce the volume.
I installed one for the same reason after my cam install, but sadly my particular combination produced a resonance frequency that would rattle the fillings out of your teeth, so it was promptly removed the next day. Other than that, I was VERY happy with the results and am sad it didn't work out for me.
I would not let this scare you. I am a unique case, as a guy I know has the EXACT same setup as me and he didn't get that resonance issue I did.
After that, if still too loud, then there is not a ton you can do(try adding cats). I have even researched alternative cat backs and none will really be much quieter than my NPP with the flaps closed, and with the insane price for a cat-backs, it just is not worth the money.
Good luck man!
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SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs.
J-Rod Built and Matt@FSP Tuned
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