Well I put my 2 12" on in Feb and they are toast... I would say about 3k miles??

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SMULESTICE VIN 100591 Mysterious, Black Pillars, Rear Spoiler, Stubby Ant., Flowmaster Hushpower II muffler w/ 2 resignators to dual outs and factory tips, Custom Cat, Norm's Dual Fascia, RK sport front end and side skirts.
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