1. High-quality Coatings

Typical aftermarket and OEM catalytic converters have a very thin layer of precious metals because of how expensive they are (Rhodium is 4200 USD per ounce). Because of the dense 700-800 cell count on OEM cats, this is not an issue, and the exhaust is cleaned effectively. However, on aftermarket 200-cell catalytic converters, there is not enough surface area for the weak coating to do its job, thus triggering a CEL for a catalytic converter inefficiency code and contributing to more pollution.

In stark contrast, HJS Motorsport catalytic converters are coated with much higher quality T38 coating - with almost 4 times the amount of precious metals, consisting of Platinum, Palladium, and Rhodium. This ensures that we can use a high-flowing 200-cell cat and not have issues with CEL’s or emissions. We guarantee all of our Catted products do NOT cause a CEL.

This High-quality coating also has a much longer lifespan. Every cat will wear out over time, but our HJS catalytic converters will last much longer, which is why we can offer an industry-leading 5-year warranty on our catalytic converter cores.

2. Metallic Triple Wound Core

The average OEM cat uses a square ceramic core, which is brittle and restrictive. The average metallic aftermarket high-flow cat uses a single-wound metal core. Single wound cores are prone to “unraveling” and failing, due to how a single wind places stress on the center joint. For these reasons, HJS Motorsport has designed a unique triple wound structure, with much higher strength than anything else available. This structure is not only stronger but more free flowing.

3. Radial Groove

Another unique innovation by HJS Motorsports is the radial groove they implement in the outer jacket. This groove prevents any movement of the wound metallic structure under high exhaust pressure and thus increases its longevity.

4.Bigger is Better

Another key factor of an exhaust's flow through a catalytic converter is it's size. This is often overlooked by aftermarket companies selling “high-flow” cats. Much like an air filter, a larger catalytic converter will flow more exhaust than a smaller one. That is why we use very large-diameter cats when compared to most other companies. Another benefit of a larger cat is that it has a greater surface area to help scrub pollutants from the exhaust gasses. More surface area also means more longevity because the precious metal coating has less work to do. The greater flow also reduces temperatures in the catalytic converter which helps with longevity. Of course, the cat must be within a specific temperature range for the precious metals to “light off” and cause the chemical reaction with the exhaust gasses and clean them. This is why every exhaust at Fabspeed is designed as a complete system, taking into account HP, exhaust flow, and proper operating temps. Using larger cats contributes to the material cost of a catted product. This is where the age-old adage of “you get what you pay for” comes into play, and it could not be any more relevant than this example.