If it were me, I would have the new pipes put on before leaving the dealer the first time. Slipons by themselves change the look and sound of the bike, but not much else. Do it.

 

The dealer put my Arrows on before the bike left the shop. Go for it.

is it advisable to put new arrow slipons on a 2002 m750
before the 600 mile servicing or is there a reason to wait?

 

just put arrow high mounts on my S4, I love them
JJ