The N55's single twin-scroll turbo hits a wall around 400 wheel horsepower — our Stage 2 High Flow breaks through that ceiling with a larger compressor wheel and upgraded internals that push your build to 800 WHP territory. This isn't a bolt-on power adder; it's the foundation for serious N55 builds that demand more than stock boost can deliver. Performance Gains Expect 100-150 additional wheel horsepower over stock with supporting modifications like fuel system upgrades and custom tuning. The larger compressor wheel maintains the N55's signature linear power delivery while supporting higher boost targets — typically 18-22 PSI depending on your build goals. Throttle response stays sharp thanks to the twin-scroll design, but now you'll pull hard through redline instead of tapering off at 5,500 RPM. Spool characteristics remain similar to stock, making this ideal for street builds that need track-day capability. Fitment N55 (2010-2018): E82 135i (2011+), F20 M135i, F22 M235i, F30 335i, F32 435i, F10 535i (2011+), F15 X5 35i, F25 X3 35i, F87 M2 Installation & Supporting Mods Professional installation is strongly recommended. Turbo R&R on BMW engines involves working in tight spaces with oil and coolant lines, plus this custom manifold product requires experience with aftermarket turbo fitment. Lead time is typically 4-8 weeks as each unit is made to order. For PWG-equipped models, we recommend upgrading the wastegate to handle the increased flow. Install videos are available, and for questions during business hours, text 813.252.1025. Need help planning your build or stuck mid-install? Text us at 813.252.1025 — we will walk you through it. Shipping Free shipping to the lower 48 states. International shipping available — contact us for a quote.
