I am fitting a new 2" exhaust to my existing 2" LCB. Which is the stingiest / best
I have a couple of options.
1 - butt the ends together and use this type of joiner (it has a couple of layers of sheet which tighten)

2 - butt the ends together and use this type of joiner with two suitable clamps
3 - use a joiner where one half goes over one 2" pipe and the other end of the joiner is inserted into the other end.