Does anyone know what the difference is between Borla'* line of mufflers, the Turbo, and the PRO XS mufflers? On my Riviera I had the Turbo mufflers and the exhaust was deep and very mellow sounding. It sounded great.. I was thinking about the PRO XS mufflers for my car now because they're cheaper and slightly smaller. I just am uneasy that they might sound ricerish. I've never heard Borla'* on a DOHC engine.. just pushrods and they sound great on the pushrods. Any advice? also, the Tubo mufflers are Center in/Offset out. I need Offset in/Center out. can you just simply turn the muffler around? I know nothing about exhaust systems. Thanks!