Which one is correct or used more often?

[welldone]

1 Do something if you want
2 Do something if you want to

I am leaning toward the first one. What would native speakers choose?

thanks

[Tdol]

It depends- the second might sound better if I didn't want them to do it, otherwise I'd probably head for the first as it's shorter.

[welldone]

subtle implication...very interesting.

thanks tdol