Eliminate the heavy and restrictive factory catalytic converters with straight-pipe, high flowing stainless steel downpipes for maximum power and an exhilarating sound.                               ...

Eliminate the heavy and restrictive factory catalytic converters with straight-pipe, high flowing stainless steel downpipes for maximum power and an exhilarating sound.                               ...

Maximum performance catless downpipes replace the restrictive primary factory catalysts with straight-through mandrel-bent tubing sections for maximum performance and exhaust sound.                  ...

Give your G8x M3/M4 more sound and power with our high-flow catted downpipe. Fabspeed Motorsport's engineering team consulted with HJS Motorsport and chose the largest HJS catalytic converter that...

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

PURCHASE DISCLAIMER: Fabspeed Motorsport does not condone the use of emission defeat devices for any vehicles used on public streets or roadways. Fabspeed Motorsport will not tamper, remove, disable,...

Fabspeed Audi RSQ8 Cat Bypass Pipes replace the restrictive factory cats with straight pipe zero restriction pipes for significantly improved performance and sound. Fabspeed Motorsport invested a lot...

Fabspeed's Cat Bypass Pipes replace the restrictive factory cats with straight pipe zero restriction pipes for significantly improved performance and sound. Porsche is constantly updating and...

Genuine HJS Tuning catalytic converter cores for replacement/upgrade of restrictive factory cats.  This is an individual catalyst; welding required.                                        ...

Eliminate the heavy and restrictive factory catalytic converters with straight-pipe, high flowing stainless steel downpipes for maximum power and an exhilarating sound.                               ...

Equal-length ULTRA high performance headers with HJS German Imported catalytic converters. Sport headers improve exhaust flow and sports car sound and feature incredible 200-cell HJS German Catalytic...

High-performance Ferrari red 4 ply heavily reinforced silicone boost hoses replace the black corrugated- single ply rubber factory hoses for up to a 10% increase in air flow. Truly dresses up the...

Replaces the restrictive factory catalytic converters with high flow 200 cell HJS cats for more sound and power.        FITMENT: X6 xDrive50i (2008-2012) X6 ActiveHybrid (2010) X6 M (2010-2012) X5...

Genuine HJS Tuning catalytic converter cores for replacement/upgrade of restrictive factory cats.  This is an individual catalyst; welding required.                                          ...

Genuine HJS Tuning catalytic converter cores for replacement/upgrade of restrictive factory cats.  This is an individual catalyst; welding required.                                        ...

Genuine HJS Tuning catalytic converter cores for replacement/upgrade of restrictive factory cats.  This is an individual catalyst; welding required                                          ...

FEATURES: Fits all BMW F10 M5 vehicles (2011+) Replaces the restrictive factory catalytic converters with ultr premium quality HJS German emissions technology extra large 200CPSI catalytic...

FEATURES: Fits all BMW F12 / F13 M6 vehicles (2012+) Replaces the restrictive factory catalytic converters with high flowing 200 cell HJS catalytic converters for increased throttle response, and a...

This high flow 300 Cell Catalytic Converter is a direct bolt-on replacement for the heavy & restrictive factory catalytic converter. Perfect for the 911 Carrera owner looking to make his vehicle...

High-flowing, direct bolt-on replacements for the bulky & restrictive factory catalytic converters provide increased exhaust flow, sound, and power while complying with most emissions regulations.   ...