mx5cartalk.com

So my cat has bitten the dust, it's rattling like a nutter... and I've lost a LOT of power...

Q.1. There's oviously something blocking the air-flow - is this likely to be blocking the flow INSIDE the cat or something has gone and got itself blocked in the pipe and/or muffler inside the rest of the exhaust somewhere?

Q.2. For my car (modified, about 90rwkw) - is there going to be much power difference between std and high-flow cat?

In answer to Q.2, a quality hi-flow cat (preferable stainless) will make a noticable difference but even more so when paired with a matching hi-flow muffler. Town & Country Exhausts in Geelong are the experts in this field and can supply you with a system tuned purely for MX5's.

I have one of their systems on my NB8A and it made a huge difference to the car, both power and throttle response. Sounds pretty great too

Alfadog, two NB8B's same exhaust from the catback(T&C) one with standard cat the other with high flow stainles cat and a real cheapy CAI;Result(from memory) a gain of around 9rwkw.Same dyno, same day.

The car with the standard cat picked up about 8rwkw from it's previous result with the standard system on.

Obviously there can be a difference between standard cars that could contribute some of the difference but it is pretty conclusive.

Steel cats are better than ceramic according to our dyno results.

Peter.

Thanks guys ... very interesting figures Peter!

I'm picking up a metal high flow tomorrow.