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I have a Bassani & love it. Im not a big fan of SLP Products simply because of their sound... they are made of nice quality stainless steel like Bassani... Just My Opinion.
bassani definately sounds better....slp's sound like a big fart
I'm guessing you haven't heard them in person. And anyways he wasn't asking about catbacks, he was asking about midpipes. I would say SLP X only because they're cheaper if your looking for stainless. They are both great pieces though and shouldn't be much sound difference between them.