Quote:
Originally Posted by regal
With a supercharger or any tune that is a lot different than stock the possibility of the cat getting too hot and breaking down exists. What I've seen on other cars is little pieces of the cat get trapped in the ex manifold and end up sucked into an exhaust valve, this engine like others is designed to pull (scavange) some exhaust for emissions.
Its just smart insurance to remove manifold cats when making big changes to factory tunes. That's any modern car.
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If anyone wants to see how bad this can be, look up what happened with Sentra SE-R Spec V's when their stock cat broke down on A LOT of cars that were 100% stock. Nissan replaced a lot of engines before removing the cat that was causing havoc.