De Catted My Motor

[craigturbo2]

What can i say,my car was Asmatic and i did not realise!
Got rid of the Cat and have found that i have got a Monster,yes U.V.noise levels have gone a bit wild but worth it.The increase in preformance really shocked me i now have a Turbo just so much more responsive.
Thought i would share that with you all now off to play need to get on a RR and soon see what the Ponies are doing.

Craig

[john purdie]

I have a 996 C4 and has pondered over removing the cats for a while. do you know of someone that could do it for me and if it is possible on my car?

Cheers
John

[ultra violent]

T2's run so rich because of CIS (at idle), that the CATs die and just create a massive restriction. Replacing my CAT was the best bolt on mod I made.

[gaity]

Would decatting have much effect on a normally asp motor?

[pesty]

I replaced fitted a cat bypass to my car (964) did alter the sound a little and it seemed to rev a little more freely but thats probably my imagination.

very easy to do on my car.

[croyde]

Interesting thread but is not a CAT a legal requirement?

Sorry if I am being daft.

[pesty]

Not on my car Yes there is a bennefit to a 964 !

I would imagine that newer cars may need the cat re fitting prior to any MOT. although maybe a modern Porsche engine could scrape by without it.

If the newer cars are as easy to do as mine was its not a problem.

edited to make sense. I think cats are only a legal requirement on cars registered after 1993 onwards.



>> Edited by pesty on Wednesday 30th March 20:17

[warmfuzzies]

emissions are the requirement, cats help you achieve this.
You do not need a cat on a car after a 93, but obviously you do need to pass the mot emissions.....

[DanBoy]

gaity said:

Would decatting have much effect on a normally asp motor?

Depends on the car. You can get mixed results.

It had a bit of an (positive) effect on my MR2 in terms of top-end HP (gained a tiny bit), but had an negative effect on low-down torque of which there wasn't much to start with anyway. I guess this was due to better breathing at high RPM and less back pressure/pulse-tuning effect at low revs.

The best thing about gutting the cat on a naturally aspirated car is the noise.

>> Edited by DanBoy on Wednesday 30th March 22:04

[jabriel]

I think cat converters are a legal requirement on cars regestered from '93 onwards...not 100% sure though.

[craigturbo2]

Quick update ,had MOT done today passed with flying colours well pleased.

Craig