If the block is cracked, you need a new engine and a new exhaust. If the block is not cracked, you need a new exhaust. There is no scenario where you do not need a new exhaust.
A4 exhaust systems are wear items. I have replaced mine probably 5 times at least since we got the boat in 1977. It really is no big deal, you go to the local plumbing store and grab some pieces and have at it.
What you are doing now is like trying to troubleshoot the shock absorbers of a car that only has 3 tires.
EDIT - is this engine FWC? If so, having a cracked block from freezing is very unlikely unless someone literally used fresh water as the coolant. You really need to start with the relatively cheap and easy solution. Exhaust-making is kind of a hobby for A4 owners, give us a few dimensions and we'll have your setup for you
A4 exhaust systems are wear items. I have replaced mine probably 5 times at least since we got the boat in 1977. It really is no big deal, you go to the local plumbing store and grab some pieces and have at it.
What you are doing now is like trying to troubleshoot the shock absorbers of a car that only has 3 tires.
EDIT - is this engine FWC? If so, having a cracked block from freezing is very unlikely unless someone literally used fresh water as the coolant. You really need to start with the relatively cheap and easy solution. Exhaust-making is kind of a hobby for A4 owners, give us a few dimensions and we'll have your setup for you
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