2011 BMW 1-series Updated with Single-Turbo N55 Inline-6, Dual-Clutch Transmission

2011 BMW 135i coupe

BMW Enhances the 2011 3 Series; Direct Injection Twin-scroll Turbo I-6 for the 335i - Green Car Congress

BMW 3 Series 5th Generation (E90) - What To Check Before You Buy

Best Tuning Mods and Upgrades for BMW N55 engines

Modified 2011 BMW 135i Coupe for sale on BaT Auctions - sold for $22,750 on December 6, 2021 (Lot #60,907)

N55 Engine, PDF, Piston

2011 BMW 135i Coupe and Convertible get New Twin Scroll Turbocharged 3.0-liter N55 Straight-Six

2011 BMW 3 Series Coupe and Convertible First Look

BMW E92 335i Tuning Guide

Officially announced changes to the 135i for 2011 (+ wallpapers) - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)