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I have the vrsf 5", but you don't need an IC until stage 2+. Stage 1+ and stage 2 run fine on the stock IC.
Check the for sale threads here, I got mine for about 150 less than new, even though the prior owner gave me some mystery pipes that were in no way intended to be used with the IC he sold me.
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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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