You're mechanic might be spot on with that one. With modifications like that I would definitely look into a tune for the new amount of air coming into the engine. I'm not 100% positive but still pretty sure you should be able to compensate that air with the stock regulator and injectors though.
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'99 Porsche Boxster 986 - weekend car
'04 BMW 645ci e63 - daily driver
'98 BMW 528i e39 - dog carrier
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