WSTN BMW N55 4” Catless Downpipe – 135i/335i/X1 35i (E82/E90/E92/E93/E84/E88)

Description

Want your N55 to sound sharper and spool faster?

The WSTN 4” Catless Downpipe unlocks serious performance and turbo response for your BMW, delivering a raw exhaust note and freer airflow that factory cats choke off.

Crafted from T304 stainless steel, this upgrade is designed for enthusiasts chasing more power, better sound, and OEM-plus fitment.

Why Upgrade?

✅ Gain noticeable turbo spool and throttle response

✅ Deep, aggressive exhaust tone under load

✅ 4” to dual 2.5” collector mates to factory or aftermarket exhausts

✅ CNC-machined flanges with perfect alignment and seal

✅ T304 stainless steel – built to handle heat and boost

✅ Includes O2 sensor bungs, plugs, and full gasket/bolt kit

✅ Direct bolt-on fit — no cutting or welding required

Fitment & Compatibility

✔️ Engine: BMW N55 3.0L Turbo Inline-6

✔️ Models:

• 2011–2013 BMW 135i (E82 / E88)

• 2010–2013 BMW 335i / 335xi (E90 / E91 / E92 / E93)

• 2012–2015 BMW X1 35i (E84)

✔️ Replaces OEM: 7605227 / 1121510600000

In the Box

• 1 × 4” Catless Downpipe

• 1 × Gasket & Hardware Kit (Bolts, Nuts, Washers if permitted)

• 2 × O2 Sensor Plugs

Installation

🛠️ Direct bolt-on OEM-style fitment — no cutting or fabrication

⏱️ Install time: ~1–2 hours (professional install recommended)

📦 Includes everything required for fitting

Enjoy the convenience of worldwide shipping on all products.

If upon receiving your product you wish to return it, we offer a 30-day returns policy.

For our in-depth returns information please follow the link below.

"WSTN Performance Shipping And Returns" 

SHIPPING INFORMATION

- We deliver Worldwide

- Most of our products are sent via express methods worldwide (FeDex, DHL, Express Post etc.)

- Full tracking free with every order.

Read more here.

Please note that WSTN Performance recommends installation by trained professionals

We highly recommend having all our products installed by a trained professional who possesses the necessary expertise and utilises the correct tools.

By entrusting the installation to an experienced professional, you can ensure optimal performance and minimise the risk of any potential damage.

WSTN Performance is not liable for any damages caused when installing our products or for potential damages

Your satisfaction and the safety of your vehicle are our top priorities.