Free delivery
3-5 business days estimated
Duration of Warranty
Permanent Warranty
Description
Flashark N55 Catless Downpipe For 2011-2012 BMW E82/E88/E90/E91/E92/E93 135i/335i 3.0L
Flashark N55 Downpipe Exhaust is designed to replace the restrictive stock downpipes in your 2011-2012 BMW 135i 335i with a more efficient, high-flowing exhaust system. The N55 downpipe allows exhaust gases to flow more freely, significantly improving horsepower and torque. By reducing backpressure, this high-quality exhaust upgrade will improve your turbocharged vehicle's overall performance and driving experience.
Fitment:
- 2011-2012 BMW 1 Series E82/E88 135i N55 3.0L Engine
- 2011-2012 BMW 3 Series E90/E91/E92/E93 335i N55 3.0L Engine
Package including:
1× Pipe
2× Gaskets
5× Screws
Specifications:
Brand Name: Flashark
Certificate: ISO9001:2000
Application: Exhaust Downpipe
Material: Stainless Steel
Surface: Mirror Polish
Model: DP29332
Shipping Information:
Free Quick Shipping to USA.
Estimated Time of Arrival: within 3-5 working days.
Stock Downpipe vs. N55 Catless Downpipe
The stock downpipe on the BMW N55 engine places a restrictive catalytic converter directly behind the turbocharger. While necessary for emissions, this design increases backpressure, slows turbo spool, and limits the true performance potential of the 135i and 335i. Upgrading to a high-flow catless downpipe removes this restriction and lets the turbo operate more efficiently, unlocking noticeable gains in responsiveness and power.
Why upgrading your BMW N55 stock downpipe makes a difference:
- More tuning potential: A catless downpipe adds 15–25 HP and 20–35 Nm on stock tune, or 40–60 HP and 60–90 Nm with Stage 1.5/2 (MHD or Bootmod3), making it a top N55 performance upgrade.
- Faster turbo spool: Reduced backpressure allows exhaust flow to reach the turbine more quickly, improving throttle response.
- Lower temperatures: A freer-flowing path helps reduce post-turbine heat for better reliability under load.
- Stronger driving feel: Improved flow produces smoother acceleration, stronger mid-range torque, and a more engaging performance experience.
Will the Flashark N55 Catless Downpipe Trigger a Check Engine Light (CEL)?
Because a catless downpipe removes the factory catalytic converter, the rear O₂ sensor may detect the increased exhaust flow and trigger a CEL. This is completely normal for all catless downpipes on modern turbocharged BMW engines, including the N55.
Many BMW owners pair the Flashark N55 Downpipe with a performance tune such as MHD or Bootmod3. These tuning platforms include options that properly manage catalyst-efficiency codes and ensure a clean, trouble-free driving experience. Without a tune, the CEL may appear occasionally, but performance, drivability, and engine operation remain unaffected.
Catless vs. Catted Downpipe for BMW N55
A catless downpipe offers the maximum flow and performance potential for the N55 engine. It delivers stronger turbo response, a deeper exhaust tone, and the highest horsepower and torque gains. A catted downpipe, while still freer-flowing than stock, provides a slightly quieter exhaust note and reduces exhaust smell but sacrifices some performance.
Choosing between catless and catted depends on your priorities. Catless is best for maximum performance and track-focused builds, while catted better suits drivers seeking moderate gains with reduced odor.
Why Choose the Flashark BMW N55 Downpipe?
The Flashark N55 Catless Downpipe is engineered for enthusiasts who demand real performance, reliable construction, and outstanding value. Its precision-built stainless-steel design, smooth mandrel bends, and high-flow architecture ensure consistent gains across the entire powerband. Backed by ISO-certified manufacturing standards and tailored specifically to the 2011–2012 BMW 135i and 335i, this downpipe delivers proven improvements in throttle response, turbo efficiency, and overall driving excitement. If you want premium performance without premium pricing, Flashark offers a high-quality upgrade trusted by thousands of BMW owners worldwide.
BMW N55 Engine Technical Overview
The BMW N55 is a 3.0-liter inline-six turbocharged engine featuring direct injection and a single twin-scroll turbocharger. Its design improves low-end torque, maintains strong mid-range power, and promotes smooth, linear acceleration typical of BMW straight-six engines. The twin-scroll turbocharger divides exhaust pulses for improved turbine efficiency and reduced lag, while the engine’s advanced Valvetronic and Double VANOS technologies optimize airflow and valve timing at all RPM ranges. Because the N55 relies heavily on exhaust energy to drive the turbocharger, reducing post-turbine restriction—such as with a high-flow downpipe—provides immediate improvements in response and performance.