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So i have an 08 bullitt with a 2.3 whipple and im assuming the canned whipple/ford tune. Bought car with blower on it and no handheld to be found.
Car is solid and use it for a daily, so i dont want to change the tune. What i want to do is buy a sct to recalibrate the speedo. Car has always been 2.5mph off, i recently went to a 275/40-18 tire and its off by about 5mph now.

So. If i buy a tuner will i be able to download the current tune as the "factory" tune and modify the speedo?
Or will the current tune be locked?
 

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The new tuner will consider the current tune the "stock" tune.
 
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