I got ms3pro so I won't be using a maf.... But the person I got it from. Was using a maf and a tune for a euro maf and it ran great. No issues. Didn't get a retune. Never got it dynod be he said he defitnely felt a huge difference. Especially in throttle respnse. So if anyone wants to do this with their current tune you can and you notice gains. Not sure how much. Darren darby is making 303whp on a mustang Dyno with this setup on an s52 with ms3pro. Also has Sunbelt cams. I will be using schrick cams
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