Fitting a decat pipe

macky_6 · Post by **macky_6** » Mon Oct 01, 2012 11:38 am

Hey all,

Wanting to re-fit the decat pipe that came with my car as i have recently passed my MOT.

Is there anything more to it than unbolting the cat and bolting on the de-cat?

Any advice welcome

Post by **Merlin** » Mon Oct 01, 2012 11:54 am

Does the "S" have a CAT temp warning light? If so you will probably need to earth it off to stop the warning light from coming on the dash.

Are you getting a custom decat made up?

Post by **vanzep** » Mon Oct 01, 2012 12:04 pm

getting the cat undone is not as easy as you might think - the bolts that Honda use to fit them tend to rust and round off making them nearly impossible to remove - when i did mine i had to cut the cat out at the downpipe side which was ok as i was replacing the downpipe at the same time. If i was doing it again i would take it to a garage which has oxy and let them undo it

sorry just reread your post - seems like the cat had been on and off b4

Post by **Merlin** » Mon Oct 01, 2012 12:08 pm

Yeah forgot about that. Every CAT I have taken off a Lude has needed the angle grinder for the bolts.

Post by **Vtecmec** » Mon Oct 01, 2012 12:19 pm

Yes, if it has been on more than a few years, it's easier to drop the whole exhaust and do the removing (typically with an angle grinder) and fitting off the car, then re hang it all afterwards.

Post by **Pushki** » Mon Oct 01, 2012 12:27 pm

I found that the gaskets had degraded, so had to use some paste to prevent it blowing.
I bought some brand new bolts for it.

Tip: Put some copper grease on the bolt threads so that it's easier to remove next time.

macky_6 · Post by **macky_6** » Mon Oct 01, 2012 12:48 pm

Thanks all

The decat has already been on the car, it was just that it was swapped off for the MOT