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I just dont get the pricing on them...they make a kit that bolts up to your existing exhaust. They can make ok power but you also need the right combo to make them work well...a stock convertered car will run like a stocker till probably 4500 rpms...so the times wont be there but the mph will be...thunder tried this on one of their shop cars. I dunno how well your M6 will do because you wont be able to build much boost off the line. I would say from a roll it will be alot of fun, but I know when ttp did the one install on the one guy from here it was like $8000 after it was all said & done.
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