Downpipe BMW E82 E88 135i E90 E92 335i N55 catless

The downpipe for the BMW E82 (1 Series) E88 (Convertible), E90 (Sedan), and E92 (Coupe) 135i and 335i equipped with the N55 engine, particularly in a catless configuration, is a popular aftermarket upgrade among BMW enthusiasts. This modification is designed to enhance performance and provide a more aggressive exhaust note by removing the factory catalytic converters.

**Models and Years:**

1. **BMW E82 135i:**
– The E82 1 Series coupe, specifically the 135i variant, was produced from 2008 to 2013.
– It features a 3.0-liter inline-six engine with BMW’s N55 single-turbocharged engine.

2. **BMW E88 135i (Convertible):**
– The E88 1 Series convertible shares the same platform and engine options as the E82 coupe.
– Produced alongside the E82, it offers the same engine configurations and performance characteristics.

3. **BMW E90 335i (Sedan) and E92 335i (Coupe):**
– The E90 3 Series sedan and E92 3 Series coupe were both produced from 2006 to 2013.
– They are powered by the same N55 3.0-liter inline-six engine found in the 135i, known for its balance of performance and efficiency.

**Detailed Description:**

The catless downpipe for the BMW E82/E88 135i and E90/E92 335i N55 engine is typically constructed from high-grade stainless steel or sometimes titanium alloy to ensure durability and resistance to corrosion. Here are the key features and benefits of a catless downpipe:

– **Catalytic Converter Removal:** Catless downpipes replace the factory catalytic converters with straight-through pipes, eliminating the restriction caused by catalytic converters. This modification is intended for off-road or track use only due to emissions regulations.

– **Increased Exhaust Flow:** By removing the catalytic converters, the downpipe allows exhaust gases to exit the engine more efficiently. This reduces back pressure, which can lead to improved turbocharger response and overall engine performance.

– **Enhanced Sound:** Removing the catalytic converters typically results in a more aggressive exhaust note. The inline-six engine’s distinct sound becomes more pronounced and sportier, especially under acceleration.

– **Performance Gains:** The improved exhaust flow can potentially lead to increased horsepower and torque, particularly noticeable in the mid to upper RPM range. Actual gains may vary depending on other modifications and tuning.

– **Direct Fitment:** Catless downpipes are designed to bolt directly to the factory exhaust system without the need for additional modifications. They are often compatible with aftermarket exhaust systems as well.

**Benefits:**

– **Performance Enhancement:** Significant gains in horsepower and torque, especially when combined with other performance upgrades and a proper tune.

– **Sound Enhancement:** A more aggressive exhaust note that enhances the driving experience, especially for enthusiasts seeking a sportier sound.

– **Weight Reduction:** Depending on the materials used, a slight reduction in overall vehicle weight can be achieved, contributing to improved performance and handling.

– **Customization:** Allows owners to tailor their exhaust setup to suit their preferences, whether focused on performance gains, sound quality, or both.

In summary, the catless downpipe for the BMW E82/E88 135i and E90/E92 335i with the N55 engine is a popular aftermarket upgrade that offers significant performance benefits and enhances the overall driving experience by improving exhaust flow and sound characteristics.