- Description
- Fitment
- Refund Policy
HIGHLIGHTS
• Improved Turbo Spool
• Aggressive Exhaust Note
• 200 Cell Sport Catalysts
• Direct Bolt-On, Fully Reversible
PROFILE
ARM Motorsports new N63/N63TU Catted Downpipes for the 4.4L V8 Twin-Turbo powered 550i allows you to take your N63/N63TU engine to the next level. Designed with the same precision as our N63 Catless Downpipes, the ARM N63 Catted Downpipes feature high-flow 200 cell ceramic sport catalytic converters positioned in the OEM location.
Made with full 304 Stainless Steel and 3" construction these downpipes provide a significant increase in power and torque over the OEM catted downpipes. In addition to the massive power gains, these downpipes open up an incredible exhaust sound from the turbocharged V8!
By replacing the OEM downpipes with the ARM N63 Catted Downpipes, you'll be removing the restriction from the OEM converters. This will reduce exhaust back-pressure and allow the exhaust from the turbochargers to flow more freely. This increase in exhaust flow allows for the turbos to spool faster, increasing power and torque throughout the RPM range of your N63.
DYNO PROVEN
Tested on an N63-powered 2012 550i GT xDrive with a Stage 2 tune, the addition of ARM’s 3" Downpipes and Cold Air Intake yielded +48whp and +43wtq, raising output to 460awhp and 525awtq. The catted version maintains nearly identical gains compared to the catless setup, while offering the benefits of a catted exhaust system.

CONSTRUCTION
Like all BMW performance components, precision fitment is critical. The ARM N63 Catted Downpipes are engineered to follow the smoothest possible exhaust flow path while easing installation. Consequently, the ARM N63/N63TU downpipes mount up to the turbos and midpipes with the same precision as you would expect from the factory 550i downpipes.The ARM N63 Catted Downpipes come with a flex section to relieve stress between the upper and lower portion of the downpipe from engine movement during aggressive driving. To further reduce any tension on the turbochargers, we have developed a lower bracket, on the lower portion below the flex joint where it is secured to the transmission housing. This is the same point BMW designed their factory N63 downpipes to be secured, which means a strong and lasting connection safe for all the components on the vehicle.

The ARM N63 Catted Downpipes utilize two O2 sensor bungs on each downpipe to allow for reinstalling the O2 sensors in their factory locations. This not only allows for the accommodation of the upper factory heat shield, but also allows the correct O2 sensor data to be sent to the DME. This is essential for the DME to properly monitor the parameters in the exhaust that are critical to having your N63 running smoothly.
IN THE BOX
• 2x ARM N63 3" Catted Downpipes
• 2x ARM Crush Brackets
• 1x Hardware Kit
FITMENT GUIDE
The ARM N63/TU Catless Downpipes are compatible with the cars on the list below that have a slip-fit style OEM downpipe only. The most reliable and accurate way is to simply look under your vehicle for the connection point between the downpipe and mid pipe. In most cases, this is visible without having to remove any undertrays or covers. If your connections look like the images below and your car is listed on the fitment chart, these will fit your vehicle. | Make | Chassis | Model | Engine |
| BMW | F01 | 750i | N63/TU 4.4L |
| BMW | F01 | 750i xDrive | N63/TU 4.4L |
| BMW | F01 | Alpina B7 | N63/TU 4.4L |
| BMW | F02 | 750Li | N63/TU 4.4L |
| BMW | F02 | 750Li xDrive | N63/TU 4.4L |
| BMW | F06 | 650i | N63/TU 4.4L |
| BMW | F06 | 650i xDrive | N63/TU 4.4L |
| BMW | F06 | Alpina B6 xDrive | N63/TU 4.4L |
| BMW | F07 | 550i | N63/TU 4.4L |
| BMW | F07 | 550i xDrive | N63/TU 4.4L |
| BMW | F10 | 550i | N63/TU 4.4L |
| BMW | F10 | 550i xDrive | N63/TU 4.4L |
| BMW | F12 | 650i | N63/TU 4.4L |
| BMW | F12 | 650iX | N63/TU 4.4L |
| BMW | F13 | 650i | N63/TU 4.4L |
| BMW | F13 | 650iX | N63/TU 4.4L |
| BMW | G30 | M550i | N63R 4.4L |
| BMW | G30 | M550i xDrive | N63R 4.4L |
| BMW | G05 | X5 xDrive50i | N63R 4.4L |
| BMW | G05 | X5 M50i | N63B 4.4L |
| BMW | G05 | X5 M50i | N63R 4.4L |
| BMW | G11 | 750i / xDrive | N63R 4.4L |
| BMW | G12 | 750i / xDrive | N63R 4.4L |
| BMW | G14 | M850i / xDrive | N63B 4.4L |
| BMW | G14 | 850i / xDrive | N63R 4.4L |
| BMW | G15 | M850i / xDrive | N63B 4.4L |
| BMW | G15 | 850i / xDrive | N63R 4.4L |
| BMW | G16 | M850i / xDrive | N63B 4.4L |
| BMW | G16 | 850i / xDrive | N63R 4.4L |
| BMW | G06 | X6 M50i | N63R 4.4L |
| BMW | G07 | X7 M50i | N63R 4.4L |

ARM MOTORSPORTS LIFETIME WARRANTY
This product is for Off-Road Use Only. Items sold for off-road use only are illegal to use on public roads in most states and provinces. This product is intended for racing vehicles which may never be used on a public road.
Returns
Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. All items are subject to 15% restocking fee from the manufacturer.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Additional non-returnable items:
Gift cards
Downloadable software products
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
If you would like to start a return please click here
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at info@amtuning.ca.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Labor Fees (if applicable)
AM Tuning Canada is not responsible for, and shall not be liable for, any labor fees, installation charges, removal charges, diagnostic fees, or other service-related costs incurred by the customer or any third party in connection with the installation, removal, modification, servicing, or use of any products purchased from AM Tuning Canada. Unless expressly agreed to in writing by AM Tuning Canada, all such labor and service costs are the sole responsibility of the customer.
Exchanges (if applicable)
To start an exchange, click here
Non-refundable items
The following items are non-refundable and non-returnable once purchased: oils, fuel or oil additives, filters, tuning cables, OBDeleven products, Braum seats, spark plugs, coil packs, and similar consumable, wheel spacers, wheels bolts, license plate brackets, electronic tuning components and any other product subject to discretion of AM Tuning Canada.
Other products from brands such as MHD, Bootmod3, Ecutek, Braum racing, Novitec are also non-refundable and non-returnable.
All sales of these items are final and are subject to the policies and discretion of AM Tuning. By completing a purchase, the customer acknowledges and agrees to these terms.
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