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The 2026 buying guide for A90 Supra owners building a fast street car. Stage 1 (450 HP) through Stage 3+ (800+ HP). What carries over from the BMW B58 platform, what is Supra-specific, and the build order we recommend at KORE SPEED.

Stage 1 to Stage 3+ tuning roadmap for the BMW S58 powering G80 M3, G82 M4, and G87 M2. Covers the closed-deck S58 architecture, port-injection-from-the-factory advantage, downpipe and charge pipe priority, fueling, and turbo upgrade paths.

Complete tuning roadmap for the BMW S55 twin-turbo straight-six powering the F80 M3, F82 M4, and F87 M2 Competition. Stage 1 (470-520 HP) through Stage 3+ (700-900+ HP). Tuner picks, downpipe + charge pipe priority, fueling upgrades, and the known S55 failure points.

Side-by-side comparison of the three BMW tuners that matter in 2026: BMS JB4 piggyback, MHD Wireless flash, and bootmod3 cloud flash. Covers N54, N55, S55, B58 (Gen 1 and Gen 2), S58. Pros, cons, price, and which one to pick.