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Does the jb4 do a good job of "custom" tuning. Like if I had just an intake, or say I upgrade to a exhaust will I even notice the diff if there are tunes for it. I know the Cobb tuner for the subarus only has like 3 settings but not specific for each mod or how many.
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07 BMW 335i (East Lansing, MI)
Winter / Sport / Premium Packages Installed
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