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My guess is with those mods you're knocking on the door of 300whp on a dynojet. I had a similar setup to yours, almost exact. Except for no secondary cats, drop in Filter on the stock airbox, and instead of the RPI catback I had straight pipes. With a really good tune you'll be pushing 310-320whp easily.
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2006 Z4 M Roadster Black/Imola Red, FBO VF-Engineering, e85 Flex Fuel-Sold
2012 BMW 135i N55 DCT Alpine White/Coral Red, FBO, TBI, Full e85, JB4 BEF-Sold
2006 Z4 M Roadster Black/Black-Sold
2021 M2 Competition DCT Hockenheim Silver
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