Core plugs on e36 m3 evo

I bought a cabrio in october 1 year, when the tax ran out at the end of the month i parked it up cos i had a hard top too.
When I came to use it in summer i checked oil, water....
Water was low so i topped it up. As i poured it in on pass side, it ran out on drivers side
Turns out there was no antifreeze and over winter it froze and popped a core plug out the block.
On an m3 they are under the exhaust fanny mould which you cant remove in the car. An absolute cunt of a job to do, i even cut the claw off a hammer to get more "swing" lol.

Not something i will rush to do again!