Drilling the CAT - is it wise?

[geoffreytro]

Hi,
Just replaced the turbo on my 2.5 TDI A4 Cabrio. The turbo guy advised putting a 20mm hole through the filter gauze just inside the catalytic converter. Looking down inside the catalytic converter there is clearly soot - however is it sensible to drill a hole through the filter gauze?
Any advice out there?

 

[jbh]

youre car is a B6 so you've posted in the wrong section..

but drilling down through the cat would allow it to breath better. most folk will just stick on a decat pipe but the MOT has got a bit stricter lately as to this.

 

[geoffreytro]

Yes, it's a B6. Maybe better I get a spare Cat rather than drilling mine!

 

[aragorn]

Smash all the guts out of it and refit it.

Diesels dont require a cat for emissions, however the MOT test does a visual check, so as long as it looks like its there then your all good.

Your engine will feel more lively and boost quicker without the cat.

 

[jbh]

yip I agree with Kev here... ive took the guts out of my spare cat to be fitted soon.

 

[leegsi]

As said just beat the insides out.

My Signum runs loads better without a cat and DPF fitted

 

[Paul @ Unit 9 Remaps]

dont drill it as theres always the chance for the rest or some collapsing in the future. why not remove all the inside and weld it up