SKU: 3065449168

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

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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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Description

BMW N55 Downpipe For 2010-2013 E8x 135i, E9x 335i - ARM MotorsportsThe ARM E Series N55 Downpipe is engineered to increase power and performance for BMW vehicles equipped with the N55 engine. By optimizing exhaust flow and reducing back pressure, this upgrade allows your turbocharged engine to perform more efficiently. Upgrading the downpipe on your N55 improves turbo response, increases horsepower and torque, and enables Stage 2+ tuning. It also enhances the overall exhaust sound of your 135i or 335i, making it

The ARM E-Series N55 Downpipe is engineered to increase power and performance for BMW vehicles equipped with the N55 engine. By optimizing exhaust flow and reducing back pressure, this upgrade allows your turbocharged engine to perform more efficiently.

Upgrading the downpipe on your N55 improves turbo response, increases horsepower and torque, and enables Stage 2+ tuning. It also enhances the overall exhaust sound of your 135i or 335i, making it deeper and more aggressive.

The ARM N55 Downpipe is designed for direct fitment and is compatible with both OEM and aftermarket midpipes. It features an 80mm V-Band flange, allowing it to work with both standard factory turbochargers and upgraded turbo setups.

For N55 owners seeking more power, a downpipe upgrade is one of the first and most effective hardware modifications.

Highlights

  • Gain up to 21 WHP / 27 WTQ
  • Faster turbo spool
  • Improved exhaust sound
  • Supports Stage 2+ tuning
  • Constructed from SS304 stainless steel

Improved Exhaust Sound

Beyond performance gains, the ARM N55 Downpipe significantly enhances exhaust sound.

Thanks to its 4.5-inch middle section, the downpipe produces a deeper and more aggressive exhaust note, especially during cold starts and full-throttle acceleration. This design creates a more pronounced and sporty sound compared to standard 3-inch downpipe upgrades.

Construction

The ARM N55 Downpipe is built using high-quality TIG-welded SS304 stainless steel for durability and long-lasting performance.

Key construction features include:

  • Precision CNC-machined 80mm V-Band flange compatible with OEM and upgraded N55 turbos

  • Integrated flex section welded directly after the flange to reduce stress on the turbo during aggressive driving

  • Large 4.5-inch middle section to improve exhaust flow and enhance sound

The downpipe transitions from the 4.5-inch center section into dual 2.5-inch flanges at the midpipe connection. This allows seamless integration with both OEM and aftermarket midpipes designed for the factory N55 layout.

Additionally, the downpipe includes two O2 sensor bungs, allowing you to reinstall the OEM oxygen sensors. These bungs are positioned higher on the pipe to prevent stretching the sensor wiring during installation.

In the Box

  • ARM N55 Downpipe

  • 2 × Midpipe gaskets

  • 4 × Bolts, washers, and nuts

Fitment Guide

The ARM E-Series N55 Downpipe is designed for the following BMW vehicles equipped with the N55 3.0L engine:

Make Model Submodel Engine
BMW E82 135i N55 3.0L
BMW E88 135i Convertible N55 3.0L
BMW E90 335i N55 3.0L
BMW E90 335i xDrive N55 3.0L
BMW E92 335i N55 3.0L
BMW E92 335i xDrive N55 3.0L
BMW E93 335i N55 3.0L
BMW E93 335i xDrive N55 3.0L

ARM Motorsports Lifetime Warranty

Every ARM Motorsports product is backed by a lifetime warranty, automatically issued at the time of purchase.

This warranty protects against defects in craftsmanship or fitment and entitles you to a replacement unit if a manufacturing defect occurs.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3065449168

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4.4 ★★★★★
Based on 28 reviews
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A
Verified Purchase
andrew
Alexandria, US
★★★★★ 5
Great value watch with all the basic functions.
This is a solid watch for the money. I think if you are looking for a training watch that doesn't break the bank, this is a good option. I looked at a ton of options, and I know there are some even cheaper entry level options, but this Ironman was a little bit of a step up in appearance and quality. To me it's worth it to get this over something in that $20 to $30 range. The Ironman was more stylish and less bulky than a lot of those options. This watch has a nice sized face that makes it easy to see without being so large that it's too much. There are some of these entry level sports/military watches that are just enormous. I'm not a huge guy so this was a much better option. One thing I am really liking is how flexible the strap is. The material has a nice give to it making it a very comfortable watch to wear. I've had some watches in the past where the bands were just too stiff and made the watch very uncomfortable. It's easy to understand and operate. I didn't even read the manual and had everything figured out after 5 or so minutes. Unless you are really going to step up and get a GPS smart watch in the $200 and up range, this watch is a great option.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 15, 2018
F
Verified Purchase
FJ
Chelsea, US
★★★★★ 5
Great watch for healthcare workers
This is a great watch that I use for my nursing clinical rotations at hospitals. It has been washed and disinfected many times and it still looks new. I can read the time without my glasses I wear for astigmatism. The light is good for nighttime or darkened rooms. I think the alarm and hourly chime are harsh sounding, but they serve their purpose if needed (The beep of a Casio digital watch is preferred, for a frame of reference).
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 5, 2026
S
Verified Purchase
Shawn Hughes
Charlottesville, US
★★★★★ 4
used solely as start watch for yacht racing: interface is good (lacks sync feature). Great value
on foredeck of a sailboat, lines and sails love to snag on stuff, especially wrist watches. Have had three torn from my wrist in 18 months. Two went overboard. I even tried to purchase super-strong spring-bars (pins that secure the band), but it was torn off again. PRO: great (intuitive, quick) interface for setting the countdown starting time, and option to repeat or count up. easy to read display CON: No sync feature: in countdown timer mode, would allow adjusting the running countdown to the nearest minute. Delay in switching modes: had left it in time-of-day mode and heard a starting signal, immediately switched to Timer mode and pressed start button, but it did not start the timer. On switching modes, it takes nearly a second for Timer mode to be operational, so need to wait until display comes on before trying to use it. Time-of-day is not visible in Timer Mode, if it was, previous issue would rarely occur. No Power down feature: my previous watch had an option to shut off the LCD display (and any audible alarms). Since I only use the watch about 100 hours (1%) of the year, this greatly extended the battery life. All that said, the dedicated sailing watches all cost two to ten times as much with the lower cost options having poor reviews on quality. For now, I'll buy these (Timex Ironman Essential 30) and just expect to loose one on average once a year.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2024
G
Verified Purchase
Glenn
Lexington, US
★★★★★ 5
Great watch - Nice large display!!
After my old Timex Ironman finally died after 21 years of reliable service (may it rest in peace after 4 replacement bands and 5 replacement batteries!!), I decided Timex deserved another sale from me! So I went surfing on the Timex website. So many Timex Ironman watches to choose from! But this one stood out for two reasons. 1) It has a nice simple design without a lot of "noise". 2) A nice large readable display. So I took the plunge! Indeed, Timex has definitely improved on their Ironman watches in the last 21 years. Most notably, the Indiglo light has greatly improved. It used to just light up the background. Now, it brightly lights up the actual digits which makes it undeniably readable without any eye strain. Another great improvement are in the set features. While the older models could only be set forward (in other words, if you went past your set point, you would need to go all the way around), this model lets you set forward and backward (so if you go too far, you can step back without going around). I don't understand one of the reviewers saying that the watch is too small. The face is quite large. The band may seem narrow in proportion to the watch face, but not excessively so. The band is 19mm wide and fits me just fine. Highly recommended!!
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Reviewed in the United States on November 12, 2017
R
Verified Purchase
RS
Carnegie, US
★★★★★ 5
Like it so far after 2 weeks of swimming.
Like it so far after 2 weeks of swimming. Have been careful nio to press buttons underwater. I Like the large numerals, backlight, countdown timer, stopwatch and alarm. My last Timex 1440 lasted 10 years before the battery was low enough that the backlight was too weak to see at night. I replaced the battery on it but did not seal the o ring well enough with silicon grease so it leaked and quit working. I also had also replaced the band once.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 9, 2024

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