German-imported 200-cell HJS Sport Cats increase exhaust flow for better power and throttle response and improved sports car sound. FEATURES: Fits all Porsche 997 GT2 vehicles (2008-2009) Less...

Replace the worn-out or broken core of your factory Porsche catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core.           ...

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

Inject new life into your M235i with a perfect high-flow catted downpipe! Genuine 200-cell HJS HD catalyst instantly adds a staggering 21 whp and 36 ft/lbs of torque at 3000 RPM without triggering a...

Meet the strictest of emissions standards while freeing up power with an HJS 300-cell catalyst downpipe.            This downpipe is produced by HJS themselves as a...

Replace the restrictive OEM catalytic converter with a free flowing HJS German tri-metallic race quality 200 cell HD core that flows 93% to 95% of a straight pipe. German-imported 200-cell HJS...

Direct replacement/upgrade for the stock OEM ceramic restrictive catalytic converters, bolt-on Ultra High Flow HJS catalytic converters. FEATURES: Fits Porsche E3 Cayenne S 2.9L Twin Turbo Models...

Replace the worn-out or broken core of your factory Ferrari 328 catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can...

Replace the worn-out or broken core of your factory McLaren catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can replace...

High-performance 200-cell HJS catalytic converters replace the restrictive factory primary catalytic converters for increased exhaust flow and improved power and sound. SOUND: Expect a mild but...

Replace the worn-out or broken core of your factory Ferrari catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core.           ...

Replace the worn-out or broken core of your factory Ferrari catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can replace the...

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            ...

Replace the worn-out or broken core of your factory Ferrari catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core.           ...

Meet the strictest of emissions standards while freeing up power with an HJS 300-cell catalyst downpipe. This downpipe is produced by HJS themselves as a solution to meet the strict requirements of...

Replace the worn-out or broken core of your factory McLaren catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can replace...

Replace the worn-out or broken core of your factory Porsche catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can replace...

Replace the worn-out or broken core of your factory Porsche catalytic converter(s) with a new high-performance HJS tri-metallic catalytic converter core. FEATURES: Fabspeed Motorsport can replace...

High-performance bolt-on replacement for the heavy and restrictive OEM catalytic converters; increases power, sound, and throttle response. SOUND: Give your 348 a moderate increase in volume and tone...