Thanks for the info guys, it gives me something to think about!!H.O.Rider said:Don't do it. I ran the DynoPort on a 670HO. It was the biggest POS I have ever paid for. Poor fit, next to nothing for weight savings, power loss and a cheesy sound to boot!! I have tried a DNE, DynoPort, MBRP and nothing is as good as the stock can. The DNE is close and sounds great.