As with all of SOLO Performance products, they have spent a lot of time, energy and testing on their free flow 2.4L catalytic converter. The SOLO 2.4L CATs are encased in a full stainless steel outer shell. The externals use laser cut stainless steel flanges for a precision fit and the internals are made of a stainless wound 200 cell catalytic coil converter. Taking time to get it right, allows the SOLO catalytic converter to be able to keep the engine light off correct also. The SOLO 2.4L catalytic converter is also made with a longer 5″ internal wound coil, instead of the less expensive 3-3.5" coil found in most other catalytic converters of this type. All of this adds up to the best aftermarket catalytic converter on the market for the 2.4L Sosltice/Sky.