BMW 2010-2013 E8x 135i, E9x 335i N55 Downpipe

The ARM E-Series N55 Downpipe is designed to increase power and performance of your N55 equipped BMW by optimizing exhaust flow and reducing back pressure. 
Upgrading the downpipe on  your N55 increases power, improves turbo spool, and allows you to run stage 2+ tuning, all while making your 135i or 335i sound better.  The ARM N55 Downpipe is compatible with OEM and aftermarket midpipes, designed for a direct fit with the 80mm V-Band flange that accommodates both standard and upgraded turbo setups.  An N55 downpipe upgrade is the first hardware upgrade every N55 owner should invest in for more power!   

IMPROVED EXHAUST SOUND

In addition to helping your N55 make more power and torque, the ARM N55 Downpipe significantly improves the exhaust sound.  Thanks to it's 4.5" middle section, the ARM N55 Downpipe will produce a deeper and more aggressive exhaust note, especially under full throttle and on cold starts. 

CONSTRUCTION

The ARM N55 Downpipe is built with high-quality TIG welded SS304 stainless steel.  It begins with a precision CNC machined 80mm V-Band flange which fits both the OEM N55 turbo as well as many N55 turbo upgrades.  The V-Band flange is welded directly to a flex section to alleviate stress from the N55's turbo during aggressive driving.  



One unique feature of the ARM N55 Downpipe is the 4.5" middle section, which transforms the sound of your N55 beyond a standard 3" downpipe upgrade.  The downpipe transitions from the 4.5" diameter at the middle section to dual 2.5" diameter flanges at the midpipe connection.  This allows for seamless integration with OEM and aftermarket midpipes that fit the OEM N55 downpipe.



The ARM N55 Downpipe features two O2 sensor bungs to allow for reinstallation of the OEM oxygen sensors.  The O2 sensor bungs are located higher up on the ARM downpipe to avoid stretching the O2 sensor wires during installation.  

IN THE BOX

FITMENT GUIDE

Handling

Orders shipped directly from our warehouse are usually processed the same business day if placed before 12 PM MST, and tracking details are provided within 1 business day.

For drop-shipped items, processing times may vary depending on the manufacturer, typically 3–5 business days. Tracking updates may take longer in such cases.

Expedited shipping applies only once the item is ready to ship.

Return

You have 30 days after receiving your order to request a return. Items must be unused, in original packaging, and include proof of purchase. Customers are responsible for covering the return shipping costs.

To start a return, email us at sales@palenonperformance.com. Returns sent without approval will not be accepted.

You can request a return directly from your account by selecting the return option on your order page. Here is the URL: https://shopify.com/55092379855/account/orders

Non-returnable items:

• Burger Motorsports (BMS) products
• Used items
  
• Air Intakes
• Hazardous materials, flammable liquids, or gases
• Discounted items and gift cards other than "PALENON PERFORMANCE" brand 

Exchanges

Return the item and place a new order once approved.

Refunds

Approved refunds are issued to the original payment method. A restocking fee is 20% will be applied. Processing time depends on your bank or payment provider. The original shipping cost will not be refunded.

Cancellations

Canceled orders are subject to a 5% merchant fee (8% for Shop Pay installments). Custom, specialized items or pre-order items canceled within their lead time are also subject to this fee. Will also incur a 10% restocking fee.

Damaged or incorrect items

Inspect your order upon arrival and contact us immediately for assistance. If the wrong part was ordered, customer covers return shipping.

Disputes / Chargebacks

Our legal team is fully prepared to take stringent action against you for filing a baseless claim and initiating a fraudulent chargeback. This will lead to civil or criminal proceedings, which would require you to engage with our attorneys in our jurisdiction.

It is crucial to understand that filing a false chargeback is a serious offense, punishable by substantial fines or imprisonment. Potential penalties for fraudulent chargebacks can include one to three years in prison and fines ranging from $1,000 to $10,000. We treat all chargebacks with the utmost seriousness, regardless of the amount, as this is classified as a felony.

We will compose all necessary information to send your account to a collections agency and request that you be served once our lawyers organize the evidence and file a case against you.