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Used both Bosch and OEM BMW with a Cobb tune.
No difference in performance with stage 1 - aggressive.
Also at 25-30K either the BMW or Bosch plugs should be swapped out if using a "real" tune.
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Arctic Metallic\CF Splitters, Spoiler, Mirror Covers\LED Tails\LSD\Tinted\Coded\Apex Square SM10-19"\LED Angel Eyes\Gloss Black Grill\Integrated V1 & Galaxy Tab\M-Performance Brakes\Cobb Tuned\xHP Flash\Resonator Removed and ->  is your friend. |