Thanks for the reply Rocketman.
my capri history is. it use to be my best friends dads car from new, he just started to do it up when he past away. he had the engine swap for one with 47k.
I have done
pod filter
valve cover seal/gasket
valve cover breather
oil and oil filter change
cleaned and flushed coolant system/ new high grade coolant
P.C.V valve
fuel filter
NGK Iridium IX spark plugs
she was running beautiful and holding boost at about 10 psi. then the muffler started rattling as if some thing was loose inside it and I lost half my boost and holds at around 4 psi at the moment.
I dont have a boost valve controller installed yet, but will be get one after the exhaust is done.
here is some more photos hope you can see from these, if it's only cosmetic like you said would save me a lot of time and money.
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I did clean up where the crack is and cleaned back of heat shield to see if anything escaped from the crack but I cant see any signs of this.