B58 GEN1 Stage 2 Tuning Package This stage 2 package includes a Wagner downpipe (catted or catless), and a Bootmod3 flash tune. This will give your B58 equipped BMW a 26% increase in Horse power, and 32% increase in torque. Decat downpipe: Downpipe Kit without catalyst converter... MSRP: Was: Now: £950.00 Choose Options