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I have AR Catless downpipes and have removed my secondary cats and replaced them with vibrant resonators, while still keeping the stock mufflers on my N54, complimented with the wastegate adjustments of the JB4 G5 ISO BOARD, the sound is absolutely amazing! It does not sound loud and obnoxious at all, but when you step on the gas it comes alive. There is no rasp at all and very minor drone thanks to the G5 ISO Board.
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