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Just to chime in, I currently run the 3-stage intake manifold, cold air intake and BMW performance exhaust. Bought the Active Autowerke software and Simon 3 to do the programming myself. What a difference! I am currently adding the AA header and contacted Viral in sales to get the tune modified. Of course the customer service from Viral was top notch and look forward to getting it downloaded and installed. Will update with final results, it should scream!
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