Midnight Motorsports 4” Downpipe
Max Flow. Max Power. Minimal Backpressure.

Engineered for maximum performance, our 4” Downpipe is the largest diameter downpipe available on the market—designed to deliver optimal turbo efficiency, faster spool, and reduced backpressure. Whether you're chasing peak power on the dyno or better throttle response on the street, this downpipe is built to perform.

Each unit is hand-crafted from mandrel-bent 304 stainless steel, ensuring smooth flow and long-term durability. Featuring precision TIG welds, CNC-machined flanges, and O2 sensor bungs, this is a high-quality solution for high-performance builds.

Key Features:

• Largest on the Market – Massive 4” outer diameter for superior flow and turbo response
• Performance Gains – Increased spool, reduced backpressure, and improved throttle response
• Complete with Hardware – Includes mounting hardware and gaskets

For enthusiasts demanding the most from their turbo setup, our 4” downpipe delivers uncompromising flow and performance.

Fits the following N55 E-series vehicles:

• 135i E88   (09/2009 — 10/2013)
• 135i E82   (09/2009 — 10/2013)
• 335i E90 LCI   (09/2009 — 12/2011)
• 335i E91 LCI   (09/2009 — 05/2012)
• 335i E92 LCI   (11/2008 — 06/2013)
• 335i E93 LCI   (11/2008 — 10/2013)
• X1 E84   (04/2009 — 04/2015)