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It would sound ok, however 4" is way to large for a 460. The question you need to ask yourself is not how the exhaust will flow at wide open throttle and 8,000 rpm, but rather how it will flow at quarter throttle at 2,000 rpm. If you go to large then the engine will loose its low end performance and fuel economy. A 3" exhaust is more than adequate and will also sound awesome. I seriously doubt a 4" system would be noticably louder or deeper with a 4" versus a 3", and oversized tips look dumb to me.
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