Down-pipe removal

[LustyLew]

Hi Guys,

as you know I've been having trouble with my nuts recently.

I've still not got around to sorting them out so I just want to confirm a few things.

If I take a blow torch to it, do I let it cool slightly before trying to remove it? Or can I use cold water to give it a suddent chill and then try?

I'm going to go out and get the nessecary bits this weekend and work on it Sunday.

Oh! Also, when using the blow torch, how long will I need to use it for, second, minutes?

Cheers for any help!
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Like a Yorkie - I'm not for the girls