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Custom tune on M4 w/ 20k miles... change spark plugs?
My local custom tuner is recommending spark plug and coil pack change (my car has 20k miles, its a 2015, before tuning. I only plan to keep the car as long as it takes for the new M3 to come out. Can I get away without this additional ~$600 job?
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2017 BMW M3 6MT Comp
2002 Porsche 911 Turbo 6MT
1972 Corvette Stingray
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