High Flow Cat

[MearCat]

A high flow cat has been proven to increase horsepower by increasing the amount of gases that can pass through it, but what makes it flow so well? Is it the number of cells (small squares you see when looking through the cat) per square inch/cm? Why does a metal-inside cat flow better than a ceramic-inside?

[RANDY]

I was under the impression that a metal honeycomb can be thinner, with larger cells because the metal heats up much more/quicker than ceramic material does, therefore burning off unburnt fuel etc much more effectively than its ceramic counterpart.

The pics i've seen of the Magic Performance cats reveal a "straight-through" design much like straight-through mufflers... It's just a steel tube through the centre of it with lots of holes.

[MearCat]

So what happens to a cat when it get's old and starts affecting flow? Does the honeycomb subtrate starts oxidising and getting deposits like the cr@p in your arteries?

[r32skyline_89]

Have no cat at all that would make more horse power just gotta watch for emission testin. When i brought my 32 i had no cat on it and had to put a magic performance cat on. Ive seen a car that would start up and the second you put your foot on the accelerator it died. Took ages to relize it was the loose honeycomb part in the cat blocking the exhaust flow