VRSF 4" Brushed Sports Cat for BMW N55 (2013+) F20 M135i, F22 M235i, F30 F31 335i, F32 F36 435i & F87 M2 (Non Comp)

Maximise the potential of your N55-powered BMW with the VRSF 4” Sports Cat. Designed for serious performance enthusiasts, these high-flow downpipes replace the restrictive factory catalytic converters with a precision-engineered, mandrel-bent and cast stainless steel system to dramatically improve exhaust flow, turbo response, and overall power delivery.

Unlike typical fabricated designs, VRSF’s cast stainless steel Sports Cats feature smooth, unrestricted transitions and a durable brushed finish for both performance and aesthetics. The larger 4” bore reduces backpressure, allowing the N55’s turbochargers to spool faster and deliver noticeable gains in horsepower, torque and throttle response — particularly when combined with an ECU remap.

The result is a sharper, more responsive driving experience, coupled with a louder, deeper exhaust tone that brings the N55 engine character to life.

Key Features:

• Full 4” cast stainless steel design for optimal flow and durability

• Smooth, gradual transitions for improved exhaust gas velocity and reduced turbulence

• Mandrel-bent, TIG-welded brushed T304 stainless steel tubing

• Significant reduction in backpressure, improving turbo spool and throttle response

• Substantial gains - 20-25 HP with tune

• Enhanced, aggressive exhaust note with increased volume and character

• Direct fit bolt-on replacement for the factory downpipes — no cutting or modifications required

• Includes all necessary gaskets and mounting hardware

• Lifetime warranty against manufacturing defects

Note: Installation will trigger a check engine light (CEL) unless paired with appropriate ECU software or a lambda sensor spacer. All M135i & 335i models produced up to 07/13 require the 3.5″ version of this downpipe. M135 and 335i models produced after 07/13 require the 4″ model of this downpipe. All M235 and 435i models require the 4″ version of this downpipe

Compatibility:

• BMW F20 M135i

• BMW F22 M235i

• BMW F30 335i and F32 435i

• BMW F87 M2 (Non Comp Model)

Who Is This Product For?

Ideal for enthusiasts seeking to significantly improve exhaust flow, turbo spool and overall engine performance. This sports cat is especially suited to vehicles running Stage 1 or 2 remaps, hybrid turbo conversions or those regularly driven hard on track or fast road.

If you’re chasing a deeper, more aggressive exhaust note while unlocking the full potential of your N55, this VRSF Sports is a must-have.

Why Choose VRSF?

VRSF has built a global reputation for delivering high-quality, high-performance exhaust and intake solutions for BMW M models. Renowned for precision fitment, durable construction and excellent value, their products have been track-proven by enthusiasts and racers worldwide.