Having spent five years with Ulster prior to moving to Dublin in 2010, Boss knows the Belfast boys even better than most and he admits the mental sparring and light-hearted texts will start flowing sooner rather than later.
"We'll keep in touch with them over the next couple of weeks and I'm sure there'll be a bit of banter between us all," said Boss, who has the utmost respect for thE manner in which Ulster have made it through to a first European final since 1999.
"I was in touch with a few of the Ulster boys during the week before the semi-finals, especially with Chris Henry not making the game because of injury - I know how much he wanted to be there.
"I'm good mates with a few of them. They've come a long way. They had a tough pool and to make it all the way through to the final is a good effort from them.
"I saw the emotion on the faces of the Ulster boys after the match against Edinburgh so we know they're definitely going to bring it to us.
"It's good for Irish rugby to have two teams in the final so it's going to be a big day at Twickenham."
Leinster reached a third final in four seasons with a hard-fought semi-final success over ASM Clermont Auvergne in Bordeaux just over a week ago.
The Heineken Cup holders had to dig deep to see off a late surge from the French giants in what a number of Boss' team-mates described as their toughest test of the season so far.
Joe Schmidt's men will head to London as heavy favourites for Europe's biggest prize but Boss insists they haven't been getting carried away as they prepare for Saturday's RaboDirect PRO12 play-off with Glasgow at the RDS.
"We've got to regroup now. We've just got to focus on putting in a good performance week in, week out now," added Boss.
"We've got to reassess and look at what we did right and wrong in Clermont.
"We watched a bit of Ulster's semi-final in the hotel (in France) but we'll break it down a bit more and try and see where we can beat them.
"None of us can look too far ahead."