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I had an 98 E36 M3 with Dinan CAI, Chip, and freeflow exhaust. I had warrenty work done several times with these mods. It was a certified used with 27k miles on the odometer on purchase, but I do not know if the certification had anything to do with accepting the Dinan mods. From what I understood, the certification was just an extention of the original factory warrenty and was never discontinued while I owned the car. All my Dinan installation was done at the dealer that completed my purchase and my service. I was extremely pleased with the Dinan products, but they were a little bit more expensive than others. If the work was actually covered by Dinan, and not my certification, it was transparent to me.
My big question would be the Dinan supercharger. What does that do to the warranty? That is where you would get the big gains.
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