Product Details
Vehicle Fitment
FAQ
Shipping & Returns
Built for Early N55 PWG Applications
This 3.5-inch catless downpipe is designed for confirmed BMW N55 applications with a 3.5-inch pneumatic-wastegate (PWG) turbo outlet. It is not a universal N55 downpipe and does not fit vehicles requiring a 4-inch electronic-wastegate (EWG) connection.
Before Ordering
- Confirm your vehicle through the fitment selector.
- Verify a 3.5-inch PWG turbo outlet.
- Check your driver's-door production label if your vehicle was built in 2013.
- This is a catless performance part; a CEL may occur and appropriate calibration may be required.
What's Included
- 1 × 3.5-inch N55 catless downpipe
- 1 × high-temperature flange gasket
- Mounting hardware
Important: Inspect or replace the factory V-band clamp if it is worn, damaged, or has high mileage.
Confirmed compatible — 2012–07/2013 BMW 135i / 335i models equipped with the N55 3.0L turbocharged inline-6 engine and 3.5" PWG V-band turbo outlet:
Important: This downpipe fits PWG (Pneumatic Wastegate) N55 vehicles only. 135i or 335i with a production date after 07/2013 will need the 4″ downpipe. Check the production date on your driver's door-jamb label before ordering.
| Year | Make | Model | Engine |
|---|---|---|---|
| 2012/2013 | BMW | M135i | |
| 2012/2013 | BMW | 335i |
Q: Which BMW models does this 3.5-inch N55 downpipe fit?
A: This downpipe is designed for confirmed 2012–2013 BMW 135i and 335i models equipped with the 3.0L N55 engine and a 3.5-inch pneumatic-wastegate (PWG) turbo outlet. Please use the vehicle selector and verify your turbo outlet before ordering.
Q: How do I know whether I need a 3.5-inch PWG or 4-inch EWG downpipe?
A: This product fits the earlier 3.5-inch PWG turbo outlet only. BMW used different N55 turbo outlet designs during the production transition, so model year alone is not enough. Check your production date and turbo outlet size before purchase. If your vehicle requires a 4-inch electronic-wastegate (EWG) connection, do not order this downpipe.
Q: Will this fit my BMW M235i, 435i, M2, or another N55 model?
A: Do not assume fitment based on the N55 engine alone. This listing is intended only for the confirmed applications shown in the vehicle selector and Fitment table. If your vehicle is not listed as compatible, please contact Flashark with your VIN, production date, and a photo of the turbo outlet before ordering.
Q: Is this a catted or catless downpipe?
A: This is a catless performance downpipe. Removing the factory catalytic converter improves exhaust flow and can produce a more aggressive exhaust note, but it may trigger a Check Engine Light and may not be legal for street use in your area. Check all applicable local, state, and federal emissions regulations before purchase or installation.
Q: Will I need a tune after installing this catless downpipe?
A: A catless downpipe can trigger a Check Engine Light because of changed O2 sensor readings. Proper ECU calibration is commonly used on modified vehicles to support the hardware change. Flashark recommends professional installation and calibration guidance from a qualified BMW performance specialist.
Q: What is included in the package?
A: The package includes one 3.5-inch N55 catless downpipe, one high-temperature flange gasket, and mounting hardware. Inspect your factory V-band clamp before installation and replace it if it is worn, damaged, or no longer seals properly.
Q: Is installation bolt-on?
A: This downpipe is designed as a direct bolt-on replacement for confirmed compatible PWG applications, with no cutting or welding required. However, access around the turbocharger is limited. Professional installation is recommended to ensure proper sealing, O2 sensor handling, and exhaust alignment.
Q: Will this downpipe make my BMW louder?
A: Yes. A catless downpipe generally makes the turbo spool and exhaust sound more noticeable, especially under acceleration. Final sound level depends on your factory or aftermarket mid-pipe, exhaust system, tune, and other modifications.
Q: What if I am unsure about fitment?
A: Please do not install the part until fitment is confirmed. Send Flashark your vehicle year, model, engine, production date, VIN, and a clear photo of the turbo outlet. Confirming the 3.5-inch PWG connection before ordering is the best way to avoid purchasing the wrong downpipe.
Q: What shipping, return, and warranty coverage is provided?
A: This product includes free shipping, a 30-day return window, and a 12-month limited warranty. Please confirm fitment before installation. Parts that have been installed, modified, or damaged may not qualify for return under the applicable return policy.
Fast Shipping Policy
Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 30-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
Worry-Free Delivery Protection
Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered. Click for Worry-Free Delivery Protection