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GT500 Quad Exhaust Valance

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I have a GT and I have already installed the boss 302 dual exhaust valance. With the GT500 quad exhaust valance fit once the Boss part is removed or does it require an entirely new bumper?
Removing the rear bumper cover isn't very hard. It's a few small screws and the rest pops off. It uses a number of push-in type connections.

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