I have this crazy upgrade itch... I currently run the APR stage 2 and DSG tune (see sig) on my S5 cab and I am interested to take it a notch further. Then again, it seems the actual whp gain of the magnuson stage 3 supercharger isn't that much over the latest release of APR's stage 2. Is there anyone out here who upgraded an S5 from stage 2 to the magnuson and what are the gains? Experience? Opinions?
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