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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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Alpine White BMW F80 M3 with the S55 engine, front three quarter view at sunset
Guide
Feb 11, 2026 13 min read

S55 Cooling Upgrades: How to Stop Heat Soak

Why the S55 heat soaks on the F80 M3, F82 M4 and M2 Competition, which charge cooler, heat exchanger, oil and DCT cooler to buy first for street or track, maker test...

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...