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Arms Motorsport

3-Inch Catless Downpipes

$447.00 $397.00 Save $50.00

SKU: N63DP

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 N63DP is a set of catless downpipes for BMW N63/N63TU 4.4L V8 Twin-Turbo engines. Constructed from 304 stainless steel with a 3-inch diameter, these downpipes are designed to improve turbo spool and enhance exhaust notes. They feature O2 sensor bungs for factory sensor locations and include a flex section with a bracket to the transmission housing for stress relief.
Show original supplier description
The ARM N63DP catless downpipes are engineered to significantly increase power and torque for BMW models equipped with N63/N63TU 4.4L V8 Twin-Turbo engines. Constructed from durable 304 stainless steel with a 3-inch diameter, these downpipes optimize exhaust flow from the turbochargers to the mid-pipe. They incorporate a flex section and a reinforced bracket that attaches to the transmission housing, mitigating stress on the turbochargers and ensuring a secure connection. The inclusion of two O2 sensor bungs on each downpipe allows for the retention of factory O2 sensors and heat shields, ensuring proper data transmission to the DME for smooth engine operation. This product is intended for off-road use only and is not legal for use on public roads in most states and provinces. European owners should note that these downpipes will not fit vehicles with the OPF (Otto Particulate Filter) system, typically found on Euro 6c/6d emissions vehicles. Visually inspecting for large filter canisters near the turbos is the best way to confirm compatibility. The downpipes are compatible with a range of BMW models including the 550i (F10/F07), 650i (F06/F12/F13), and 750i (F01/F02), as well as Alpina variants. Fitment is specific to vehicles with a slip-fit style OEM downpipe connection to the mid-pipe.

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

BrandArms Motorsport
Part NumberN63DP
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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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