I have a friend that has the AFE cat back, and installed to vibrant ultra-quiet resonators right after the cats made a big difference for him, he also put turn down exhaust tip right after the axle. He said that turn down tipped help with the Drone, virtually eliminated it
I'm probably going to just get regular resonators installed but the vibrants do look like they would do the trick a little pricey though. Everything else is stock I really thought the cats would of toned down any cat back system guess I was wrong.
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