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BMW 428i F32 Downpipe Guide — Catless | N20 2.0T | Power Gains, Sound & Installation
The BMW 428i F32 is a stylish, capable grand tourer powered by the N20 2.0-liter turbocharged four-cylinder. While often overshadowed by its six-cylinder siblings, the N20 responds remarkably well to bolt-on modifications — and a catless downpipe is the single most effective hardware upgrade for this platform.This guide covers the catless downpipe upgrade for the 428i F32: power gains, exhaust sound changes, and why an ECU calibration completes the package.The N20 2.0T — Platform OverviewThe N20B20 is BMW's 2.0-liter turbocharged four-cylinder, producing 245 HP and 258 lb-ft in the 428i. It uses a single twin-scroll turbocharger with direct injection —...