- Description
- Fitment
- Refund Policy
HIGHLIGHTS
• Faster Turbo Spool
• Improved Exhaust Sound
PROFILE
An F30 N55 Downpipe is regarded as the best hardware upgrade to get the most power from your N55 powered F3X BMW. The ARM N55 Catted Downpipe offers the same benefits as the catless option with added benefit of reduced exhaust odor.
The stock N55 downpipe comes from the factory with a catalyst that severely restricts exhaust flow. Upgrading your downpipe unlocks power, improves turbo spool, allows you to run stage 2+ tuning, and increases the exhaust note of your N55 powered BMW all at once. An N55 downpipe upgrade is the first hardware upgrade every N55 owner should invest in.
ENHANCE THE SOUND OF YOUR N55
CONSTRUCTION
The ARM N55 Catted Downpipe is built with mandrel bent SS304 stainless steel and backed by the ARM Motorsports Lifetime Warranty. The ARM N55 Catted Downpipe starts with a 4" diameter at the precision CNC machined turbo v-band connection. It transitions to the 5" 200 cell sport catalyst, and gradually reduces to a flared joint to optimize exhaust flow while matching up to the stock midpipe v-band connection perfectly.
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. A tune or CEL Delete will be required to avoid a check engine light from displaying on instrument panel.
FLASHING STAGE 2+
By improving exhaust flow the ARM N55 Catted Downpipe prepares your F-Series BMW for the higher boost tunes. If you already have a software program for your N55 chances are these tune files are already pre-loaded into your software waiting for you to flash after your downpipe installation. Most tunes require an upgraded downpipe and FMIC to run properly, if you don't also have an intercooler upgrade check out our F3X FMIC. The ARM N55 Catted Downpipe will allow you to run any tune that requires a downpipe upgrade. Stage 2 N55's can see power around 400whp and 400wtq.

IMPROVED EXHAUST SOUND
In addition to helping your N55 make more power and torque, it significantly improves the exhaust sound. While the downpipe only accounts for approximately 20% of the entire exhaust system, upgrading it will produce a noticeable increase in volume, especially under full throttle and on cold starts. If you're looking for a more extreme sound, you can pair the ARM N55 Catted Downpipe with a full exhaust. The ARM N55 Catted Downpipe is compatible with any aftermarket exhaust that can connect to the stock N55 downpipe.
IN THE BOX
FITMENT GUIDE
The ARM F-Series N55 Catted Downpipe is designed to fit the vehicles listed on the chart below with a 4" EWG Turbocharger only.
| Make | Model | Submodel | Engine |
|---|---|---|---|
| BMW | F20 | M135i | N55 3.0L |
| BMW | F20 | M135i xDrive | N55 3.0L |
| BMW | F21 | M135i | N55 3.0L |
| BMW | F21 | M135i xDrive | N55 3.0L |
| BMW | F22 | M235i | N55 3.0L |
| BMW | F23 | M235i | N55 3.0L |
| BMW | F30 | 335i | N55 3.0L |
| BMW | F30 | 335i xDrive | N55 3.0L |
| BMW | F31 | 335i | N55 3.0L |
| BWM | F31 | 335i xDrive | N55 3.0L |
| BMW | F32 | 435i | N55 3.0L |
| BMW | F32 | 435i xDrive | N55 3.0L |
| BMW | F32 | 435i Gran Coupe | N55 3.0L |
| BMW | F33 | 435i | N55 3.0L |
| BMW | F33 | 435i xDrive | N55 3.0L |
| BMW | F34 | 335i | N55 3.0L |
| BMW | F34 | 335i xDrive | N55 3.0L |
| BMW | F34 | 335i Gran Coupe | N55 3.0L |
| BMW | F36 | 435i | N55 3.0L |
| BMW | F36 | 435i xDrive | N55 3.0L |
| BMW | F36 | 435i Gran Coupe | N55 3.0L |
| BMW | F87 | M2 | N55 3.0L |
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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