COBB Tuning Stage 1+ Power Package – 2011 BMW N55 335i / 2011 135i

Cobb Stage 1+ Power Package — BMW N55 Models

The Cobb Stage 1+ Power Package for BMW N55 models combines the Cobb Accessport V3 with a Cobb aluminum charge pipe kit for the single twin-scroll turbo N55 3.0T inline-six.

DETAILS

• Includes: Cobb Accessport V3 + Cobb aluminum charge pipe kit
• Covers: 2011 BMW 335i and 135i — N55 3.0T
• OTS maps: 91 octane, 93 octane — N55 application-specific
• Aluminum charge pipes: eliminates factory plastic crack failure mode
• Accessport live gauges, data logging, BMW-specific extended code diagnostics
• NOTE: Ships via UPS/FedEx — signature required at delivery

BMW N55 Application-Specific Calibrationand Charge Pipe Reliability

The BMW N55 single twin-scroll turbo inline-six is one of BMW’s most celebrated modern performance engines. The twin-scroll single turbo produce a broad, progressive boost curve with good low-end torque. BMW’s factory calibration carries conservative boost and timing targets that leave meaningful headroom on quality 93-octane North American premium fuel. Cobb develops N55 OTS maps separately for each application — the 335i, 135i . The 2011 N55 uses a different ECU configuration than later N55 applications, which is why it receives its own Accessport device with N55-specific maps rather than sharing with the N54. The N55’s plastic charge pipes are a known failure point — they crack under sustained elevated boost, creating boost leaks that are difficult to diagnose. Cobb’s aluminum charge pipe kit eliminates this failure mode with crack-proof aluminum pipes that also reduce restriction in the charge air path between the turbos and the throttle body.

BMW Diagnostics, Data Logging, and Stage 1+ Charge Pipe Solution

The Accessport’s diagnostic capability is particularly valuable on N55 BMWs — the N55 generates its own set of boost system and injection codes that require BMW-specific diagnostic capability. Real-time gauge display shows boost, AFR, IAT, and coolant temperature — data the factory BMW cluster does not provide. High-speed data logging captures everything for ProTuner custom calibration review. The aluminum charge pipes are a permanent solution to the N55’s most common boost system reliability issue — solving it proactively as part of Stage 1+ is more cost-effective than diagnosing a boost leak after a crack develops.

What’s in the Box

• Cobb Accessport V3
• Cobb aluminum charge pipe kit for N55
• OBD-II cable
• USB cable
• 2 faceplates
• Universal mount

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system — not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The Cobb Stage 1+ package for the BMW N55 is the starting point for a platform that rewards calibration work dramatically. The N55 responds to a quality 93-octane OTS map with a transformation in throttle response and boost delivery that BMW owners consistently describe as the most impactful single modification they have made. Stage 1+ also solves the N55’s most common reliability vulnerability simultaneously — aluminum charge pipes as part of the performance upgrade.

Fitment

Year	Make	Model	Notes
2011	BMW	335i	N55 3.0T
2011	BMW	135i	N55 3.0T