A simple radio with some normal size lightweight speakers isnt going to hurt anything. If you decide to run OEM exhaust you need something to listen to anyways.
I run the OEM exhaust, with a cut-out, that way I can hear the engine when I need/want.
Miles of unwanted cable, however, is unwanted. Every penny, toy, wire, nut, chewing gum that you find under your carpet and in the corners of the trunk you find is some 0.XXXX% of fuel economy and horsepower waiting to be unleashed.
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