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the only reason people dont do it is because as you do more and more mods the computer has less info to take in and comprehend...if you know you wont be doing anything to the car for a while a SD tune is the way to go...you should generally make more power and have just one less complication in there(maf). Personally I love speed density but you have to know what the persons plans are with the car to be able to determine if its a good or bad thing for them to get into.
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