BMW M135i (N55 pre-July 2013) intercooler & catless downpipe kit

For early N55 M135i owners - specifically pre-July 2013 cars with the non-EWG N55 - this is a fast-road or track-day focused upgrade. No guesswork, no fluff.

• 5" bar-and-plate front-mount intercooler: 90% more surface area and ~100% more volume than OE
• Catless downpipe in UK-fabricated T304 stainless: mandrel-bent, laser-cut flanges, TIG welded
• Real gains: 10-15 bhp, cooler IATs (high 20s °C vs 75-80 °C stock), sharper spool and throttle response
• Aggressive exhaust note, reduced heat soak, stronger mid-range torque under load

Professional fit recommended. Fits only N55 M135i built before July 2013.