How many cats are needed to pass an MOT on a 2002 WRX?

From my understanding there is a cat in the up-pipe, down-pipe and cat pipe.

If I was to remove the up pipe cat, the downpipe cat and the centre cat, but replace the centre cat for the MOT, would it pass?

If it wouldn't it's probably not worth replacing the up pipe.

Adam

 

you should be able to pass an MOT with just the centre cat..

Simon

 

.... a very hot centre cat

Shaun

 

Yes it needs to be hot. I've got a sports cat on my downpipe (the only one in the system) and at the last MOT it was pretty borderline until it was up to temperature.

 

Silent:
Which sport cat D/P and is it a 3'' right through pipe?
Thanks,
Graham

 

Is a Sports cat every bit as good when it comes to Mot time as a std cat ? (ie if it's the only cat left on the car)

 

It's a Graham Goode one. Didn't have any fitting problems except it didn't have the right boss for the EGT sensor. Not the end of the world I know, but I like everything to be correct. They modded my sensor to fit their boss so it got sorted in the end.

There was no particular reason for getting the GGR one. It was just at the time, my downpipe had knackered up, I needed a new one, I wanted a sports cat and it was the only one around at that time...H&S were six weeks away from their next batch.

Certainly when you're running around normally, it definitely doesn't smell or sound decatted. But the MOT does test for emissions on a cold engine and that's where it falls down. Just glad I've got it in the downpipe and not in the centre section where it would take even longer to get up to temp.

 

Okay, so maybe not such a good idea.

Hmm, decision time!