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[omega3000]

Flexi joint 

No Flexi on V6, assuming this is his 2.5 V6? 

Ah was thinking of 4 pot soz 

[Webby the Bear]

Yep, no flexi joint. I'll swap out the gasket and see what happens. I'll make sure all manifold bolts are tight too.

So for future and my own learning.... best way to look for leaks is shove a rag up the exhaust while someone holds on to it and then the leak will be obvious and spewing out i presume??? if theres no leak the engine should stall? How long should it take to stall?

Ps, i can get that gasket off the cat on the omega at school. but are new ones dealer only? i jolly well cant find them on the net??

pps, exhaust paste on the flange of the cat to manifold connection.... 2 things:
1. does it matter if the paste gets on the gasket? might be awkward trying to avoid it
2. positioning the downpipe is quite difficult. the paste sets quite quickly. does that matter?

[05omegav6]

Don't block the exhaust for long and don't rev it when blocked, as you could quickly turn a slight blow into a big hole... Never pretty

Check it when properly cold, and before starting, liberally coat all the joints/seams with soapy water. That way when you block the exhaust it should give you bubbles at the point of leaks.
With a cold exhaust the leaks will be more apparent as they tend to dissappear as the exhaust heats up and gaps close

[Webby the Bear]

Don't block the exhaust for long and don't rev it when blocked, as you could quickly turn a slight blow into a big hole... Never pretty

Check it when properly cold, and before starting, liberally coat all the joints/seams with soapy water. That way when you block the exhaust it should give you bubbles at the point of leaks.
With a cold exhaust the leaks will be more apparent as they tend to dissappear as the exhaust heats up and gaps close

EXACTLY what i was thinking Al. i'll do that cheers mate