upgrade from 2.03 to 2.30 - questions

I had vbulletin upgraded to 2.3 and I was wondering if all the hacks I did will still appear in the code after the upgrade?

I'd like to have a clean slate to work from (start from scratch) and I noticed that my templates are still there.

Are the hacks I did to the files still there too? I guess I could check, but I'm sure I can get a more thorough answer about what's changed and wahat's not.

Thanks...

[Smoothie]

all the code hacks done to the .php files will be erased when upgrading, unless you use a compare app. All of your custom templates will remain unchanged, but depending on which templates have changed, you will need to revert and add the code back.

[Logtenberg]

thanks for the confirmation