F80 RSS

The S55 twin-turbo inline-six responds to downpipes harder than almost any other mod you can bolt on. On the BMW M3 F80 and M4 F82, the factory catalytic converters sit immediately downstream of the twin-scroll turbochargers — creating a restriction right where exhaust gas velocity peaks. Replace them with aftermarket downpipes, pair with a Stage 2 ECU calibration, and you're looking at 500+ WHP from a 3.0-liter six-cylinder. This guide covers everything you need to know before buying downpipes for your F80 M3 or F82/F83 M4: catless versus 200-cell versus 400-cell GESI high-flow cats, real-world dyno numbers, exhaust sound changes,...

The BMW S55 3.0-litre twin-turbo inline-six is one of the most tuneable engines BMW has ever produced. Fitted to the F80 M3, F82 M4, F83 M4 Convertible, and F87 M2 Competition, the S55 delivers 425 HP in the standard M3 and M4 and 431 HP in the M4 CS and M2 Competition. With ECU calibration alone, Stage 1 builds regularly exceed 550 HP — and with the right hardware, the S55 platform is capable of 800+ HP. Across the GCC, the F80 and F82 remain among the most popular BMW performance platforms, and YPG Motorsport has tuned hundreds of S55-powered...