N55 Race Downpipe 3.5” and 4” for 135i, M235i , M2, 335i , 435i

The factory downpipe on the N55 platform is designed for emissions compliance and creates significant restriction in the exhaust system. These race downpipes eliminate that restriction, allowing exhaust gases to flow more freely, improving turbo response, increasing power, and delivering a more aggressive exhaust tone.

Available in both 3.5-inch and 4-inch configurations, each version is designed specifically for the correct wastegate type to ensure proper fitment and performance.

Key Features

• Direct OEM fitment
• Available in 3.5” (PWG) and 4” (EWG) configurations
• Catless race design for maximum exhaust flow
• Significant reduction in exhaust restriction
• Improved turbo response and power output
• Increased exhaust volume and aggressive tone
• Precision CNC-machined flanges
• Mandrel-bent 304 stainless steel construction
• TIG-welded for strength and durability
• Compatible with factory and aftermarket exhaust systems

Build Quality

Manufactured from 304 stainless steel with smooth transitions and precision welds to ensure optimal exhaust flow and long-term durability under high heat and boost conditions.

Fitment

Fits

• BMW 135i (N55)
• BMW M235i
• BMW M2 Base (N55)
• BMW 335i
• BMW 435i

Wastegate / Size Selection

• 3.5” Downpipe: For PWG (Pneumatic Wastegate) models up to 07/2013
• 4” Downpipe: For EWG (Electronic Wastegate) models from 08/2013 and newer

• For off-road use only
• Catless design will trigger a check engine light without proper tuning
• ECU tune recommended for optimal performance
• Must select correct version based on production date and wastegate type
• Professional installation recommended
• Please include your VIN in the order notes so we can confirm fitment and supply the correct product
• If installation is selected, this order will be shipped to our Burbank installation location for scheduled service

Shipping

• Estimated delivery: 4–8 business days
• Tracking provided once shipped

Warranty

• 36-month warranty covering manufacturer defects only
• Covers defects in materials or workmanship under normal use

Exclusions

• Does not cover improper installation
• Does not cover misuse, abuse, or neglect
• Does not cover normal wear and tear
• Does not cover damage caused by selecting incorrect version or failing to verify fitment

Installation by BimmerTechsLA

• If installed by BimmerTechsLA, labor is covered under warranty for 36 months
• Labor coverage applies only to issues directly caused by a defect in the product
• Labor warranty does not cover issues caused by incorrect part selection, unrelated parts, pre-existing conditions, or customer-requested reuse of worn components

Installation & Delivery

• Installation available at BimmerTechsLA (Burbank, CA) upon request
• If installation is selected or a free-shipping/install code is used, your order will be shipped directly to our installation location
• By selecting installation or using the install code, you agree to have your product delivered to BimmerTechsLA for scheduled installation
• Orders without installation selected will be shipped to the customer’s provided address