de-cat a stock downpipe

[Pappu1]

whats the best way to decat a stock downpipe

i assume will be same process for wrx as well at TT legacy?

mate has a 96 gtb and wants to decat the stock downpipe - any how to be good

[Marky]

Marks method

Remove DP

Cut pipe

Bashbashbash

Weld pipe back together and bolt back on car

[Pappu1]

does bashing remove all the cat material lol

wont the heat shields come in the way?

wud it be better to somehow cut eh cat out and then weld a straight pipe in place or does that not work well?

[Marky]

Well yeah that would make more sense (welding a pipe in place instead), would be much tidier

For what its worth there was/is a set of downpipes for TT on trademe for like $230 or so not long ago

[Pappu1]

 Marky said:

Well yeah that would make more sense (welding a pipe in place instead), would be much tidier

For what its worth there was/is a set of downpipes for TT on trademe for like $230 or so not long ago

he is a cheapskate and is a bit of a diy guy

lol he was even gona run the stock bov vent to atmo lol

had to convince him otherwise hahaha

[Marky]

Put it this way - if you\'ve got the pipe, then do it that way, way nicer.

The bashbashbash method works, just don\'t breathe in any of the cat stuff (seriously get a filter mask or something haha) - there\'s also a metal mesh thing round the inside of it - make sure you pull that out too.

Internet reckons doing it on a BG is asking for troubles with the primary - just make sure it\'s not going insaneo boosty after you gut it and cross fingers I guess

[Pappu1]

will let him know abt the mesh

hmm he is doing some vac hose mod and getting more boost from the setup already

dunno what that is abt as have not seen under bonnet but he says its high teens( think he said was 18 or something lol)

yea bg legacy...poor car gets a hiding

[johnny5]

Be careful that stuff coming out of it is toxic bro!

[Guest]

Also sell it to scrap metal once its out.

[lachlan]

i removed the heat sheild off the bottom . cut like a 30 mm square hole in the bottom . bash bash shake shake repeat as required . weld square peice back in and tach yeat sheild back on . guranteed fit . minimum of welding

or you can cut the cat open lengthwise and just pluck both cores out

def do both cats but be prepared with knowledge and parts to take boost controll into your own hands

i was replacing the primary turbo on mine at same time so bored the wastegate hole out in the housing .