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[Marks DTM Calib]

Flexi joint is easy to replace and you can get stainless clamp in sections for around 20-25 quid.

[mkaminski100]

Flexi joint is easy to replace and you can get stainless clamp in sections for around 20-25 quid.

Hack saw is good enough to cat it but I am concerned if clamp will survive this pressure. Will it not leak?

[cem_devecioglu]

Just to tell my experience , whatever I use instead of original cats ,

the welding areas sooner or later leak ..Yes even the electrical welding

dont keep long (few months) .. And when it does, consumption go crazy

They say the original gm exhaust is chrome alloy so welding dont

keep long  :-?

[mkaminski100]

I am also concerned about that. Best way would be to use a camera on long lead to drop it from downpipe side and check if cat is knackered. Otherwise it’s the mid section. Cheap mid box cost £30 (in some places £50-60), Bosal is £60, and GM with TC is ca £80. It’s a lot just to check something. Catalytic converter (whole section) is about £250. Bit expensive to make probes and check which is knackered…

[mkaminski100]

Any ideas on how to check which exhaust part is blocked without cutting it or replacing?

[Marks DTM Calib]

Any ideas on how to check which exhaust part is blocked without cutting it or replacing?

Take the cat off an blow through it.....dead obvious when there is any restriction.

As for the flexi joint, I thought you were referring to the flexi piece in the front pipe failing.

[mkaminski100]

Any ideas on how to check which exhaust part is blocked without cutting it or replacing?

Take the cat off an blow through it.....dead obvious when there is any restriction.

As for the flexi joint, I thought you were referring to the flexi piece in the front pipe failing.

There is no leak in exhaust, but to check if cat is blocked I would have to cut pipe in upstream the cat (where the joint is). I any situation it’s good to change flexi joint (upstream the cat).
I think that cat would have to be completely clogged if I wouldn’t be able to blow (would explode when driving).
There is no other way to find out which box is blocked than to cut it or replace it…

[Bandit127]

For a meagre price compared to the alternatives, you could try some Cataclean. Those nice chaps on the TV keep on about how good Cataclean is for your exact problem  

A regular and sprited drive in the country is probably just as good at keeping your cats clean.

[philhoward]

Trying to think of the stuff, but there is a "magic lotion" which does actually seem to bring dead cats back from the dead - I think made by Forte?

A lot of times, an "italian decoke" can reap wonders..but beware that if your exhaust is on its last legs, it will probably spit its stuffing out - in which case it's knackered anyway.

Its amazing how much more a rusted, dead exhaust weighs than a new one - all the trapped carbon.

[mkaminski100]

I am not sure that it makes those miracles that they advertise…
http://www.lexusownersclub.co.uk/forum/lofiversion/index.php/t14124.html
http://www.lexusownersclub.co.uk/forum/lofiversion/index.php/t13642.html

I will try to drive it for a while and  do the emission test. If it will be under the limit then mid section is knackered and needs replacing.