I currently have the Roush CAI installed on my 07 GT with the MVT in and now I am looking at grabbing a SCT tuner and getting a tune for the car for greater gains. I am wondering though if there is a big difference in tuning with the MVT in vs taking it out. My car is pretty much stock other than the intake and some mufflers. If the difference is not that great I would prefer to leave the MVT in just to make it easier if I need to bring the car in for work at the dealer. However if the difference is great I will pull it out and get the tune for that.
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