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[Omega 37]

Replacing my front pipe. Do i use sealer on the manifold and two joints on the pipe. There is a joint with a gasket in front of the cat and a flange butt joint where it joins the middle exhaust section.
The cat has a warning label saying no sealer to be used on the joints in front of it. Can damage cat!!!
help 

[RobG]

Replacing my front pipe. Do i use sealer on the manifold and two joints on the pipe. There is a joint with a gasket in front of the cat and a flange butt joint where it joins the middle exhaust section.
The cat has a warning label saying no sealer to be used on the joints in front of it. Can damage cat!!!
help 

[05omegav6]

Replacing my front pipe. Do i use sealer on the manifold and two joints on the pipe. There is a joint with a gasket in front of the cat and a flange butt joint where it joins the middle exhaust section.
The cat has a warning label saying no sealer to be used on the joints in front of it. Can damage cat!!!
help 

You should renew the gasket though

[ronnyd]

Have you bought genuine? After market ones can be dubious quality to say the least, as i once found.

[Omega 37]

ebay £96  fits perfectly

[ronnyd]

Has it passed an emissions test yet?

[Omega 37]

just had an mot in aug
if it fails i'll just change the software for the test 

[tunnie]

I've seen and heard Omega's running cats from eBay, not very nice sound terrible.

I'd always recommend second hand genuine if you can source one, what was wrong with the old one?

As others have said though, no sealer, just a new gasket 

[Omega 37]

I bought the two middle sections and tail pipe from ebay for my previous mig, 3 years no probs. £120 delivered
same on this car 1 year ago, sound great
now the front pipe, sounds great

[Omega 37]

old pipe split at the flexible connection

[05omegav6]

old pipe split at the flexible connection

Probably a bit late,cbut it is more cost effective to replace the flexi joint

Keep the old pipe and have it repaired ready for when the new one fails

[tunnie]

old pipe split at the flexible connection

As Al mentions, that flexi can be cut out and re-welded in. Far cheaper   

Costs around £10 for the flexi, then just need local expert with a welder. That nice chap Mr DTM did mine 

Should know, my 2.2 is on it's 3rd flexi

[smalt36]

What do you guys do at the butt joint/ flange between cat and 1st section of exhaust, mine just had paste in when I took it apart butt cat came with a crush sort of gasket which I have attempted to use butt I think its blowing, passed mot though!

[terry paget]

What do you guys do at the butt joint/ flange between cat and 1st section of exhaust, mine just had paste in when I took it apart butt cat came with a crush sort of gasket which I have attempted to use butt I think its blowing, passed mot though!

I use, and recommend, Loctite SI5990 copper silicone high temperature sealant, Halfords £5.99 per 100 ml. tube, gives a flexible high temperature resistant seal.

[Andy H]

What do you guys do at the butt joint/ flange between cat and 1st section of exhaust, mine just had paste in when I took it apart butt cat came with a crush sort of gasket which I have attempted to use butt I think its blowing, passed mot though!

I use, and recommend, Loctite SI5990 copper silicone high temperature sealant, Halfords £5.99 per 100 ml. tube, gives a flexible high temperature resistant seal.

repeat after me NO SEALANT.
Silicone buggers the lambda sensors. You can use it between the centre sections and the back box if you like but the downpipe joint is too close to the lambda sensor.