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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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Portimao Blue BMW M3 Competition G80 with the S58 engine, low front three quarter view
Guide
Jan 15, 2026 16 min read

S58 Stage 1 vs Stage 2: Which Do You Need?

What separates Stage 1 from Stage 2 on the S58 in the G80 M3, G82 M4, G87 M2, X3 M and X4 M: what each bootmod3 and MHD map assumes, why the...