yeah, if you rev your engine while looking at the air pump, you'll see that past around 3k it just stops working.

So that brings the question, how do you drive your car? If you drive it hard most of the time, the cat then shouldn't clog up, as the air pump doesn't work past 3k anyway.

But if you drive it like a granny, shift at 3k, it probably wouldn't last long.

Am I on the right track here?