And given a few weeks and lots of expensive tuning and dyno time, it can be done. Tune, test and then run in the real world to see if you still have a street driveable car or if something you did that helped on the power chart is counterproductive. Then iteration number 2 thru n of the cycle till you get it right for that set of mods. Make enough mods to the same engines and enough tests and you begin to get the effects of the various parameters down but, given the investment, you probably aren't going to share much.
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