Used the sprint booster on my z for maybe 7k miles and although it definitely did help under full load and faster shifts, during daily driving, it didnt reduce the throttle response time what so ever. It simply exaggerated the response so for example, normally 10% throttle would be close to 40% throttle on the red or race mode. Was tuned with Ecutek and was able to produce the same effect except more to my liking and the tune also seemed to reduce response time.
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