Unleash the full power and performance of your BMW N55 engine with the Untd. Performance 4″ Catless Downpipe. Engineered specifically for the 2013-2018 M135i, M235i, M2, 335i, and 435i (F20/F21/F22/F30/F32/F33/F87), this high-flow downpipe upgrades your exhaust system with a full 4-inch diameter, designed to maximize power gains, improve turbo response, and deliver an aggressive exhaust tone. Whether you’re tuning for track performance or looking to enhance the driving experience on the street, this downpipe is the perfect solution.
Key Features:
Full 4” Catless Design for Maximum Exhaust Flow
The Untd. Performance Downpipe eliminates the restrictive factory catalytic converters and replaces them with a full 4-inch diameter. This upgrade drastically improves exhaust flow, reduces backpressure, and allows your engine to breathe more freely, resulting in significant performance increases. Ideal for high-boost builds and heavily tuned setups, this downpipe ensures your engine can reach its full potential.
Loud, Aggressive Exhaust Tone
With the removal of the factory catalytic converters, the exhaust note becomes far more aggressive. Experience a deeper growl, sharper turbo spool, and a louder, more visceral sound with prominent pops and crackles that enhance the motorsport-like character of your BMW. Whether you’re on the street or track, the exhaust sound is guaranteed to turn heads.
Increased Power & Faster Turbo Response
By optimizing exhaust flow, this downpipe enables your turbochargers to spool more quickly and efficiently. The result is faster turbo response, reduced turbo lag, and an overall increase in horsepower and torque across the entire RPM range. This translates into immediate power gains that you can feel when driving hard, whether on the track or during spirited drives.
Durable, High-Quality Construction
Crafted from high-grade 304 stainless steel, the 4” Catless Downpipe is built to withstand high temperatures and demanding driving conditions. TIG welding ensures superior strength and durability, while precision CNC-machined flanges ensure a perfect, leak-free fit. This downpipe is built to last and perform under extreme conditions.
Direct Bolt-On Fitment
Designed for ease of installation, the 4” Catless Downpipe bolts directly to your factory turbos and mid-pipes. There’s no need for welding or additional modifications—simply bolt it on for immediate, significant performance improvements.
Track-Ready, Emissions-Delete Setup
This downpipe is engineered for off-road and motorsport use. It is ideal for racing builds or high-performance street cars where emissions compliance is not required. The catless design maximizes exhaust flow and sound, making it perfect for enthusiasts seeking unfiltered power.
Compatibility:
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BMW M135i (F20/F21) N55 3.0T I6
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BMW M235i (F22) N55 3.0T I6
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BMW M2 (F87) N55 3.0T I6
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BMW 335i (F30/F31) N55 3.0T I6
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BMW 435i (F32/F33/F36) N55 3.0T I6
For BMW owners looking to push the limits of their N55-powered M135i, M235i, M2, 335i, or 435i, the Untd. Performance 4″ Catless Downpipe delivers the ultimate combination of power, sound, and turbo performance. Crafted for enthusiasts and built to handle extreme conditions, this downpipe ensures you get the most from your BMW’s turbocharged engine.
⚠️ Note: This product is intended for off-road and track use only. Not emissions-compliant in all regions. Please check local laws before installation.
