I have a 90 240 with 100K miles and I need to replace the header pipe. That's the pipe between the exhaust manifold and the catalytic converter. Where I live we have real winter and hot summer. The car is quite rusted, but works like a new one.
Given it has never been unscrewed, I'm concerned about breaking the bolts from the exhaust manifold.
The nuts are copper, btw. (At least the new ones I got).
Any advice as to the best method/tools/technique to use to achieve that while minimizing the risk of damaging the exhaust manifold.
In case you wonder, rust has perforated holes in the header pipe and I do need to change it.
Thank you