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[cazcar]

2.5 v6 auto omega with back pressure problem , checked breather system all clear does anyone know any other causes as this one has burst a couple of hoses at front of engine , the car is a 95 reg.

[Darth Loo-knee]

Could be your cats mate, when you look at the front of the engine there is a silver/chrome pipe running horizontally to a rubber hose just infront of the Air Con Pump, this pipe blows when Cats are blocked as a rule

[CaptainZok]

Could be your cats mate, when you look at the front of the engine there is a silver/chrome pipe running horizontally to a rubber hose just infront of the Air Con Pump, this pipe blows when Cats are blocked as a rule

There's another one at the other end of the pipe on the drivers side of the engine.
As Daz says if these are blowing out it usually points to a blockage in the exhaust system.

[Andy H]

There was a thread on here by someone who found that one of the non-return valves had failed in one of the stainless air injection pipes that bolt onto the exhaust manifolds.

I imagine that would cause hot exhaust gases to pressurise the FAI pipes without there being a fault with the CATS.