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I've been going to Dynasport for several years with my E39 540/6. Ryan the owner has always treated me well and fairly and stands behind their work. I know he knows the 1 series well as he owns a 1M himself. I used Matrix Integrated for my Dinan flash because Dynasport isn't an authorized dealer and they wouldn't let them do the flash. Matrix seemed like a decent shop but I don't have any other experience with them other than the Dinan install.
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