For anything near 450-520whp, just get a pure. Tried and tested, there's no reason to go bigger.
Also, cars typically tend to stop being reliable when you throw 200whp on top of what they made stock.
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2011 Space Grey 135i DCT:
Pure Stage 2, Fuel-it Stage 2 LPFP, ST XTA Coilovers, Berk Street Axle Back, MHD Stage 2+, VRSF Catless DP, VRSF 5" FMIC, VRSF LCP, BMS UCP, M3 FSB, e92 M3 Drivers Seat.
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