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I put a relatively inexpensive exhaust system on my 01 S that I bought from a retailer on Ebay. There is good news and bad news here. The bad news is there is drone at low RPM's. The good news is it sounds amazing at high RPM's and it has more power. I'm convinced this system is essentially glass packs but I was surprised how much performance gain I got. I think they are restriction free for the most part.
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