bmwe21.net forums

I'm not convinced the pressure check will see if the cat is rattling? It just makes sure that there's flow which there would be regardless. Cats are expensive so only replace if you have to.

The alternator will make a lot of noise if it's bad, same with the ac. It's the bearings that go you see.

Good point nas80....It will be very interesting if and when I get to the bottom of this.