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so i have been waiting to see any numbers on the jb4 before I purchase solely because of the statements that our car is tuned already and it may not provide significant increase in performance. - when you see the times on car and driver for the m40i review they state the times are 13sec. for 1/4 mile. How would those numbers be achieved without a jb4? Launch control ? would that statement be accurate or are there other factors involved that im not considering ?
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