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OneFastShop B58 catless downpipe, the cornerstone Stage 2 hardware for the M240i, M340i, 440i and Supra
Latest Guide
Aug 4, 2026 17 min read

B58 Stage 1 vs Stage 2: Which Do You Need?

B58 stage 1 vs stage 2: what each map assumes, bootmod3 and MHD gains, the Gen 1 vs B58TU fuel limit, real parts costs, and what Supra and...

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OneFastShop B58 Stage 3 brushless LPFP bucket assembly for F chassis M240i, 340i and 440i
Fuel
Jun 30, 2026 13 min read

B58 Stage 3 LPFP: 1000 WHP From a Single Pump

Our F chassis B58 Stage 3 brushless LPFP runs one pump on the factory control and is rated for 850+ whp on E85. What it fixes, what it cannot (the Gen 1...