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ARM Motorsports

S55 3" Stainless Steel Downpipes

$525.00 $397.00 Save $128.00

SKU: S55DP

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The ARM S55 Downpipes are a performance exhaust component designed to connect turbochargers to the mid-pipe. Constructed from SS304 stainless steel, these 3" downpipes feature a smooth, gradual transition from their 3" inlet to a 2.5" exit, optimizing exhaust gas flow by avoiding the abrupt reducers found on some aftermarket options. This design aims to maximize power and torque while enhancing the exhaust note.
Show original supplier description
The ARM S55 Downpipes are engineered for performance, serving as a direct replacement for your vehicle's OEM downpipes. Crafted from durable SS304 stainless steel, these 3-inch diameter pipes are designed to smoothly integrate into the existing exhaust system, transitioning to a 2.5-inch exit to mate with OEM mid-pipes. This gradual transition minimizes exhaust gas turbulence, a common issue with abrupt reducers, leading to improved flow. These downpipes are intended to maximize power and torque output, offering a significant improvement over stock components. The product is designed for Stage 2 tuning and above, indicating its suitability for modified vehicles seeking enhanced performance. The manufacturer claims potential gains of +30whp and +30wtq, though this is likely dependent on supporting modifications and tuning. Included in the box are the ARM F80 M3 Resonated Downpipes, a CNC machined bracket for the front-turbo downpipe, and the necessary hardware for installation (4x downpipe to mid-pipe bolts/nuts). ARM Motorsports also backs these downpipes with a lifetime free-replacement warranty against defects in craftsmanship or fitment, and a 30-day money-back guarantee. These downpipes are compatible with the BMW F80 M3, F82 M4, F83 M4, and F87 M2 Competition models equipped with the S55 3.0L engine. It is important to note that this product is intended for Off-Road Use Only and is illegal to 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 NumberS55DP
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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