Having replaced the middle section and rear section on mine a few times, I really can't see how you can damage the front section, IF you take your time and take care disconnecting the fixing bolts, and prising the flanges apart.
This takes some thought, and the procedure of the order of disassembly needs to be worked out. BUT if someone else is doing it...it's not their risk, and it can be an opportunity for an additional sale...:doh
However, if you go at it like a bull at a gate, and drop the exhaust and rely on twisting to separate the flange, then yes, it can shear.
If I was undoing the bolts, I would make sure there was no twisting of the exhaust, in fact, an angle grinder on the bolts would be less stressing to the front pipe.
Hang on... aren't these people supposed to be experts in exhaust replacement ?...
Now remind me again... why I do all the servicing on my Maverick, and source the parts, and fit them myself....:nenau
If I allowed "some" garages to do the work, then I doubt I would be running a 19 year old motor.
Oh did I mention..... no I won't, it's getting boring now.:doh :lol:lol:lol
( read my signature :lol:lol)