hi folks a bit of advice please,i have got a spare set of headers coming r1200gs twin cam,any advice please on how to get the cat out please ,any benefit to doing this ,i am only doing this as i have been given these headers for nothing 
cat in the headers how to remove
- Thread starter fizzer
- Start date
patzx12
Registered user
I have seen people cutting the end of the cat off and re-welding.
I have not decatted myself but look at cutting a rectangular window at the bottom and gouging out the guts.
It would be easy to weld a patch over the hole and you wouldn't be concerned about how neat the weld is.
I have not decatted myself but look at cutting a rectangular window at the bottom and gouging out the guts.
It would be easy to weld a patch over the hole and you wouldn't be concerned about how neat the weld is.
I use a 1 mm slitting disc, cut through the middle of the existing weld then chain drill around the edge of the cat core to remove it.
Tig weld it back together and you have to look very closely to see it has been tampered with.
Tig weld it back together and you have to look very closely to see it has been tampered with.
any power increase do you think,is it worth the bother
I had this done to my headers and ran them with a Remus end can and I could definitely feel the difference. I recently purchased and fitted a proper set of decat headers (BOSS) and the difference is night and day!! My advice would be hold out for a nice set of used Remus/Akra/Keihan/BOSS decat headers..........it's a far better solution.
yeh thank s i understand that ,to be honest i didnt want to spend too much ,these pipes are free,the bike has had the flapper took out and has had a hilltop remap
comberjohn
Registered user
I've done what Mistacat has. As he says, done right and there's no evidence.
It will be a slightly more raspy note and gives a slight boost high up the revs.
One small point. If yours is an SC, the TC headers will fit your bike, but your silencer won't match the headers. Even with a flappy valve eliminator.
Just noticed the new post. It is a TC.
It will be a slightly more raspy note and gives a slight boost high up the revs.
One small point. If yours is an SC, the TC headers will fit your bike, but your silencer won't match the headers. Even with a flappy valve eliminator.
Just noticed the new post. It is a TC.
yeh its a twin cam ,and the headers are also from a twin cam
BlueBird
Registered user
Search is your friend FFS
Its all here,
http://www.ukgser.com/forums/showth...W-R1200GS-I-DID-IT?highlight=decatting+did+it
Its all here,
http://www.ukgser.com/forums/showth...W-R1200GS-I-DID-IT?highlight=decatting+did+it
Here's a quick synopsis:
Removing Cat will give you a small but noticeable boost of low down grunt with the standard end can.
Fitting an end can without removng the Cat will give you more noise but little else
Removing Cat (or fitting new headers) and an end can gives you a bit more oomph again.
K&N filter is an expensive trinket which adds nowt
No need for a Power Commander or remao as the system copes well unless you run a straight through system.
Removing Cat will give you a small but noticeable boost of low down grunt with the standard end can.
Fitting an end can without removng the Cat will give you more noise but little else
Removing Cat (or fitting new headers) and an end can gives you a bit more oomph again.
K&N filter is an expensive trinket which adds nowt
No need for a Power Commander or remao as the system copes well unless you run a straight through system.
Bendy toy
Registered user
I got a really obvious improvement when I fitted Remus headers to the OEM silencer can - compared ti the OEM headers with catalyst. I paid £150 used so it really wasn't worth the faff of chopping and welding the OEM catalyst.
The OEM header without catalyst has a poor gas flow because the gas from each side is fed into a Y-joint designed to carry the catalyst matrix The hot gas then has to cram itself down the smaller outlet pipe so no wonder the gas flow is nothing special. The flow issue with the catalyst is the trade off between having a cat and not having a cat.
I got a further improvement when I fitted an Akraprovic system with straight through cans, But I also got a lot of noise. So without a dyno run its impossible to say if the fancy system gave any meaningful benefit. But it does look good and I have just got 41mpg over 360 miles at "how fast officer" speeds. But the baffles are going back pdq because I can't cope with having to use ear plugs for every trip to the shops.
The OEM header without catalyst has a poor gas flow because the gas from each side is fed into a Y-joint designed to carry the catalyst matrix The hot gas then has to cram itself down the smaller outlet pipe so no wonder the gas flow is nothing special. The flow issue with the catalyst is the trade off between having a cat and not having a cat.
I got a further improvement when I fitted an Akraprovic system with straight through cans, But I also got a lot of noise. So without a dyno run its impossible to say if the fancy system gave any meaningful benefit. But it does look good and I have just got 41mpg over 360 miles at "how fast officer" speeds. But the baffles are going back pdq because I can't cope with having to use ear plugs for every trip to the shops.
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