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Sprint Booster (Throttle Mapper/Tuner)
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10-30-2016, 10:12 AM
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Graffix
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Drives: 2013 550 xi M sport
Join Date: Oct 2016
Location: NJ
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Thanks for a great review. I recently got my 550 and after driving for several days, I got the same impression, that throttle response was lacking. I'm curious if there is any negative impact.
Appreciate
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Graffix
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