Exhaust› Exhaust Pipes, Systems and Components

ARM Motorsports

3-Inch Catless Downpipes

$297.00

SKU: N54-DP-3

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The ARM Motorsports N54-DP-3 is a set of 3-inch catless downpipes designed to enhance exhaust flow for N54-powered BMW 335i models. Constructed from 304 stainless steel, these downpipes replace the restrictive OEM catalytic converters, allowing for increased power and torque. They also enable the use of higher boost settings for tunes like Stage 2 and beyond.
Show original supplier description
The ARM Motorsports 3" catless downpipes are engineered to elevate the performance of your N54-powered BMW 335i. By removing the restrictive OEM catalytic converters, these downpipes facilitate a significantly freer exhaust flow, directly translating to increased horsepower and torque. This improved flow is crucial for vehicles running higher boost levels, such as those utilizing Stage 2 tunes and beyond. Constructed from durable 304 stainless steel with a 3-inch diameter, the ARM downpipes are designed for optimal exhaust flow and back-pressure. Each downpipe includes two O2 sensor bungs, allowing for the remounting of factory BMW O2 sensors to maintain exhaust gas monitoring by the ECU. It is important to note that due to the catless design, an ECU tune or a CEL (Check Engine Light) fix will be necessary to prevent a dashboard warning light. This product is specifically designed for RWD vehicles including the BMW E82 1 M Coupe, E82/E88 135i, and E90/E92/E93 335i and 335is models, all equipped with the N54 3.0L engine. The downpipes come complete with a hardware kit and new gaskets for installation. ARM Motorsports offers a lifetime warranty against defects in craftsmanship or fitment. Please be aware that this product is intended for Off-Road Use Only and is illegal for use on public roads in most states and provinces.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandARM Motorsports
Part NumberN54-DP-3
CategoryExhaust

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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