Hiya Peter
Fitting TOR pipes won't need re-jetting.
As for removing the snorkel - I've heard mixed reports but I get the impression that you gain very little (if anything) in doing this.

It's at this point everyone who HAS removed the snorkel will hang me out to dry! Such is life.
Also pipe up those who did remove it ... only to put it back in, I know you're out there.