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i have gone in fully modded for service and they only notice the exhaust. i usually do oil changes every 3000 to 5000 miles and car runs fine so far. try to get your plugs checked out around 25,000 miles maybe closer to 30,000 miles depending on how you drive.
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Rs7 : 10.4 133.50 with a 1.7 60ft Toyo R888
F10 M5: 11.308 131.96 with a 1.9 60ft Street Tires
E90 M3: 11.2 126.7 with a 1.8 60ft Street Tires
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