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  1. M109R Shop Talk
    Just wanted to share my experience with what a lot of people are raving about. I have 73000 miles on my 09 m109r and thought I needed to replace my plugs cause my mileage seemed to be dropping, so I spent about 40 on a set of 4 NGK Iridium plugs. Worse mistake I've ever made. I have a TFI fuel...
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