All Things Mk5 > Performance Modifications

Edition 30 pre-cat mod

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rickyquicky:
Hi all, new owner here!

Will be posting an introduction as soon as i've cleaned the car and take some decent pictures.

At the moment i'm reading up and planning the mods I want to do to the car. One of the first is to remove the pre-cat from the exhaust system.

I've read that you can take the downpipe off and hack the stuff out, but I would rather buy some sort of replacement. Are the pre-cat and cat part of the same pipework? Or is there a join between them?

The reason I ask is because ideally I would like to just buy a piece of pipe to replace the whole pre cat section, but still keep the standard cat. Have read a fair few threads and am presuming that there is no join between them and therefore not as simple as buying a replacement pipe?

Thanks in advance  :happy2:

rickyquicky:
From what i'm reading online it seems the the pre-cat and cat are all 1 piece, therefore it's not as simple as buying a replacement pipe for the pre-cat that will just bolt on to the standard cat...is that correct?

If that is the case is it best to take the whole lot out and get a pipe welded in place of the pre-cat?

Tamiyoman:
The pre-cat is a just some grey stuff that looks like concrete, just chisel it out carefully and you don't need to change pipework

vag12:
I am a bit confused, I have 3" blueflame TBE is it possible for me to have a precat still?

GrayMK5GTI:
All your information on pre-cat removal right here:

http://www.mk5golfgti.co.uk/forum/index.php/topic,41083.0.html

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