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I’ve been searching for a whole day on the forum for answers and can’t seem to find any, I recently deleted primary & secondary cats On my V, outside tone sounds amazing, but when you get inside to start the vehicle it almost seems as if every bit of noise comes into the cabin. Car is obnoxiously loud at idle and cruising speeds, I can hear a bunch of weird noises coming from where the primary cats used to be and it does not sound very good. Any insight on what this could be or a solution to it ??
 

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Better sound system.
 

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No, no ... forget what these guys are telling you. Put in 5" straight-through round Magnaflow mufflers. Put them where the primaries used to be ... cut to make them fit. They are straight-through high flow, but absorb all of the obnoxious sounds. One on each side.

Bill
 

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Get headers, I heard a V with headers for the 1st time this past weekend and MY GOD, it put my B&B test pipes with cutouts to shame!!! I didn't want headers but after hearing it in person, I'm sold!
 
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