can you remove inners from cat converter?

17th November 2009, 11:48

is it possible to remove the inners froma cat so in theory it could be a decat?ive heard of this done before but is it easily done or just bollocks that wont work?thanks

17th November 2009, 12:10

i wouldnt like to due to the harmless materials inside - decats arent that expensive anyway.

IF you HAVE to do it make sure you wear a mask etc.

17th November 2009, 12:13

theres harmfull materials inside? if did do it how do you get it apart anyway?

17th November 2009, 12:16

I've heard of people pushing a bar up into the CAT and bashing the hell out of it til all the inside bits falls out, it's like bits of honeycomb lol

17th November 2009, 12:23

haha.so by doing that ud get the same as a decat.would it sound like a decat or would it be shit ?

17th November 2009, 12:27

Erm, well in theory it removes what's restricting the flow, so you could possibly see a small gain, but you would be safer off with a de-cat, then at least you still have a CAT for MOT time

17th November 2009, 12:28

It would be a de cat obviously... but would be more restrive then a aftermarket one.

17th November 2009, 12:41

ah right.well its only a spare in the shed so thought id experiment.im running a sports cat atm and ive got a few spare exhaust bits so mite aswell.you cant take them apart tho can you?so its just smashing sumin down there to get the shit out.what is actually inside anyway?

17th November 2009, 12:44

It's like a honeycomb substance inside.

I assume it's job is to filter/dilute the fumes.

But yeah, if you have a spare one, try it, and let us know the difference

17th November 2009, 12:47

Blow torch?

17th November 2009, 12:50

As has been said, the cat contains a honeycombe like structure that is coated in certain substances (platinum being one of them) that convert the exhaust gases in to Nitrogen, Oxygen, Water and Carbon Dioxide. It also provides back pressure and reduces noise.

Even if it's a spare cat, you're better off buying a decat or removing the cat box and welding some pipe in it's place.

17th November 2009, 12:52

Quote:

Originally Posted by Finchowned

As has been said, the cat contains a honeycombe like structure that is coated in certain substances (platinum being one of them) that convert the exhaust gases in to Nitrogen, Oxygen, Water and Carbon Dioxide. It also provides back pressure and reduces noise.

Even if it's a spare cat, you're better off buying a decat or removing the cat box and welding some pipe in it's place.

OP, there's your answer right there^^^

And btw, do not go near your CAT with a blow torch.................

17th November 2009, 12:53

yeh.but if i was to remove the inside bits.all this scientific words make the insides sound abit harmful ha.so im having second thoughts now

17th November 2009, 12:55

as long as you use a mask and goggles and gloves (mabe chemical suit) you'll be fine

Ive heard of people sawing it in half and taking some of the honneycomb out to make it more of a sport cat then welding it back together.

17th November 2009, 13:41

i smashed the crap out of the one on my old corsa till it was empty started it up and it sounded shit! is your on the mani or underneath? would be alot better just to cut it out sleve another pipe over it and weld it up. thats what i did and was alot better.

17th November 2009, 13:49

cost me 35 quid for a full stainless hand made decat just buy one dude and keep ur cat for ur mot's !!!!

17th November 2009, 13:50

haha.ive just done it.found some old mx handlebars in the shed so rammed it into the cat and got rid of all the shit inside.now its hollow.fitted it onto the car and fuck is it loud with the 3 inch cherry bomb backbox.willget a vid up shortly of it but if you cant afford a decat get the insides out of the standard cat.works and doesnt sound like pants

17th November 2009, 13:52

haha class

Will look forward to vids

17th November 2009, 13:58

indeed how do i get the vids to show on the page then?

17th November 2009, 14:01

fairenough everyone likes money saving mods

but now u gotta buy a cat for mot and there alot more expensive

17th November 2009, 14:01

Upload it to www.photobucket.com

Then post the link on here

17th November 2009, 14:09

ah right ok then.im already a member of there so il jst do it

17th November 2009, 14:22

Lols looking forward to hearing this

17th November 2009, 14:23

haha mad.will be with you in 15 mins people

17th November 2009, 14:45

Quote:

Originally Posted by luke_freeride

haha mad.will be with you in 15 mins people

its gone 15 min lol get the vids up

17th November 2009, 15:02

haha now it sounds more crisp and raspier in person but the poor mike quality makes it sound abit lower pitched

17th November 2009, 15:04

17th November 2009, 15:28

i done mine like this and it sounded like a tank where the gases rattle inside. Buy a decat.

17th November 2009, 15:30

ah right well mine doesnt rattle.so its ok

17th November 2009, 17:04

Mine never rattled and sound much nicer than the proper magnex decat I used to have. Not as raspy and deeper.

If you read the informetion on the GMC website, it actually states that its better to keep a box in the system rather than running a straight through pipe from manifold to backbox. Something to do with resonance iirc.

17th November 2009, 17:15

oh.i dno.im not intending on keeping this decat on anyways

17th November 2009, 19:07

I have a Cat Manifold on my car, but it's got nothing inside it because I took the cat out due to my dippy mate shooting Air Rifle Pellets inside it.

It sounds really nice, dosen't sound bad and I did get a Gain in low end power and it backfires in this cold weather too, sounds great

17th November 2009, 20:11

Quote:

Originally Posted by Andy_K

Mine never rattled and sound much nicer than the proper magnex decat I used to have. Not as raspy and deeper.

If you read the informetion on the GMC website, it actually states that its better to keep a box in the system rather than running a straight through pipe from manifold to backbox. Something to do with resonance iirc.

Sounds interesting tbh.

luke_freeride is your cat under your car or in the manifold

I might consider actually doing this because atm i am very skint

18th November 2009, 11:46

hey ant809099: yes its under the car,i just got an old set of mx bars and wacked the hell out of it then just kept shining a torch in there to check everythings out.youll have like a silver powder coming out.but keep smashig inside untill everythings out.then i ran a jet wash through it and its spanking inside now.

18th November 2009, 11:57

Quote:

Originally Posted by Andy_K

If you read the informetion on the GMC website, it actually states that its better to keep a box in the system rather than running a straight through pipe from manifold to backbox. Something to do with resonance iirc.

Really?

Don't suppose you have the link matey?

18th November 2009, 19:39

Quote:

Originally Posted by Liam_LFC_VTR

Really?

Don't suppose you have the link matey?

Here you go

18th November 2009, 19:53

cats are worth money at scrappies anyway......so buy a decat pipe then sell your cat to the scrappies and make your money back.......