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Appreciate the feedback! I was wondering if the plugs being a step colder were an issue. I got them figuring they would be fine for running stock boost, and then would also have me set for when I hope to be pushing 18-19 pounds down the road. I'll have to pick up another set of iridiums

Year/Make/Model: 2009 Speed 3 Mileage: 105K Miles Location: Charlotte, North Carolina (sea level) Concern: Spark advance is high, engine is misfiring and running hot DTC's: P0300 P0403 (EGR) U2064 U2619 Modifications: Cobb FMIC, Cobb BOV, Cobb Turbo Inlet + Intake + Airbox, Cobb Boost Control...