Thread: Drilling out the cat converter

Not sure about drilling out, I know with some others it is a case of fitting a straight through pipe through the centre, however just be aware that whatever you do technically may be illegal if you get an inspector that knows what they are looking for. While I dont think the cat is a requirement in Australia modifying any part of a vehicle like this from standard can have implications. I would ensure first that this is a legal mod as I know on most petrol engine cars it is not.

From memory, it's a big no-no on post 2007 vehicles.

Having said that, if I was inclined to modify it I'd pull out the entire section (need to pull the cross member and front prop to do this?) and drill out the honeycomb centre with a long bit. Alternatively, I'd fit a a bolt on de-cat pipe from one of the UK mobs.

Personally, I intend on fitting a full hi-flow system that includes a hi-flow cat.

My indie mechanic removed the cat and drilled out the innards.

Truck runs better - a bit more ooomph at low revs, reduced EGTs and also reduced heat by the driver's footwell.

You cannot do this if your Puma has a DPF, only a 'passive' cat.

Originally Posted by n plus one

From memory, it's a big no-no on post 2007 vehicles.

Having said that, if I was inclined to modify it I'd pull out the entire section (need to pull the cross member and front prop to do this?) and drill out the honeycomb centre with a long bit. Alternatively, I'd fit a a bolt on de-cat pipe from one of the UK mobs.

Personally, I intend on fitting a full hi-flow system that includes a hi-flow cat.

That's what I am about to do, I got a two piece from Gary at alive tuning? Being stainless steel with a bracket to mount the factory heat shield, you can chop the original and fit without removing the cross member and prop. Or do as I,m going to do remove whole and to preserve. It looks so good it could be factory! :

I removed my cat and centre muffler over 3 years ago.

Used stainless TF de-cat and centre pipe.

Definently better low end response and much cooler drivers floor, although I did wrap the de-cat with ceramic wrap.

Yeah I'm aware that there are aftermarket front pipes available that replace the catalytic convertor, I was more interested in information about drilling the converter as I have seen mentioned on here several times.

The inside/matrix of a catalytic converter looks like this:
http://mkrd.info/uploads/images/audi..._before_sm.jpg


It is a ceramic matrix with a "wash coat" of rare earth metals.

Originally Posted by isuzurover

The inside/matrix of a catalytic converter looks like this:
http://mkrd.info/uploads/images/audi..._before_sm.jpg


It is a ceramic matrix with a "wash coat" of rare earth metals.

.... and worth anywhere from $120 to $350 scrap price, Regards Frank.