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With the exception of a few of these most are just rebranded chinese alibaba crap. I had one of these setups when I first bought my car and it was awful. Way too loud and obnoxious and valves closed sounded worse than stock.
I think valved exhausts can be done right but I have gone back to the good ole standard muffler.
*Edit: The evolve unit was probably the highest quality (made by supersprint) and had the most refined and clean sound. To my knowledge they are no longer made.
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