Looking to increase the power on your BMW 135i and 335i with the N55 single turbo engine. Install the Active Autowerke 135i N55 Downpipe and unleash the true power that is hidden in your BMW 135i and 335i. The turbo is often described as a device ...

Looking to increase the power on your BMW 135i and 335i with the N55 single turbo engine. Install the Active Autowerke 135i N55 Downpipe and unleash the true power that is hidden in your BMW 135i and 335i. The turbo is often described as a device ...

The Active Autowerke BMW E46 M3 Header is designed to increase exhaust flow without losing power which can sometimes be a tricky proposition. These headers are developed to create optimum flow and eliminate restriction that rob much desired ...

Aggressive track-designed exhaust system providing maximum flow and power; recommended for off-road and track use only.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ...

Aggressive track-designed exhaust system providing maximum flow and power; recommended for off-road and track use only.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ...

Aggressive track-designed exhaust system providing maximum flow and power; recommended for off-road and track use only.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ...

Dramatically improve sports car sound and throttle response with upgraded Maxflo mufflers and inlet tubing.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ordering   ...

Dramatically improve sports car sound and throttle response with upgraded Maxflo mufflers and inlet tubing.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ordering   ...

Dramatically improve sports car sound and throttle response with upgraded Maxflo mufflers and inlet tubing.  Includes Deluxe Bolt-On Tips in Polished Chrome, Black Chrome, or Carrera GT Style Tips. Please specify when ordering     ...

Equal-length performance headers improve exhaust flow and sports car sound; Sport Headers include 200-cell HJS Sport Catalytic Converters.                               ...

Equal-length performance headers improve exhaust flow and sports car sound; Sport Headers include 200-cell HJS Sport Catalytic Converters.                               ...

Free-flowing headers without catalytic converters; designed for maximum power and exhaust flow for race and track applications.                                   ...

Replaces the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance.                                 ...

Replaces the heavy, restrictive, and redundant factory secondary catalytic converters with a straight-through tubing section for increased power, sound, and weight savings                       ...

High performance drop-in replacement for the factory air filter; fits OEM Porsche 986 Boxster air box for improved airflow and performance.                               ...

High-flowing X-Pipe replaces the heavy and restrictive factory exhaust system for maximum increase in performance and sound                                     ...

Direct replacement/upgrade for the failure-prone factory headers; lighter, higher flowing, and more durable for increased performance and longevity           Please specify if you have a 2.7 or 5.2 when you checkout  ...

Replaces the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance.                                 ...