De-Cat a Mk3 GTI 8v

[Cupra Turbo]

If I De-Cat my 8v will it fail the emissions test?

Does the 8v NEED the cat? I heard some cars dont NEED it to pass the emissions test...

[adyh]

Yes you wil fail the emmissions test .

The reason other cars can pass without one is due to the fact that they were built before manufacturers were forced to put them on every car .

[richandhazel]

I was able to remove the one from my Audi but that is because its on an 'H' plate, 1991. I think its from April (or thereabouts) 1992, all vehicles must have a cat fitted and will be tested accordingly.

[richandhazel]

Just looked in the MOT manual and it looks like its August 1992 onwards:-

http://www.motuk.co.uk/manual_730.htm

[golfvr6]

Yep that is correct, Aug 92 K reg onwards will require a cat. Rich is correct as ever  

[Cupra Turbo]

so de-catting will make my emissions too high?


I know lads who've de-catted their cars and they pass MOT's and sum have W Reg Scooby's and new Corsa's etc

[golfvr6]

August 92 onwards, a car MUST be fitted with a cat, it is illegal to use on the road if removed. Must be a dodgy MOT.

[modulater]

Its common practice on vehicles after august '92 to fit the cat back on for MOT's and remove it the rest of the time and fit a bypass pipe.
 
If you get stopped for a random roadside emissions test I think you would be a bit screwed if your cat wasn't in place.

[winstonb]

I there any point to removing the cat?  i know the idea is to remove a and obstacle to air flow, but does it actually improve performance noticably?  isnt the Lambda sensor inside the cat, so wouldnt removal mean the injection system cant adjust itself quite right?

sounds like too much trouble for being uninsured, which you definatly will be...

[golfvr6]

When changing the cat for a pipe , the lambda sensor will screw into that.