Twin cam 103 Reduce speed

Servus I’m planning on getting a 2014 Street Bob in just over a month Since I’ve already read in a few posts that the sound of the twin cam is not really intoxicating (compared to the evo) I would like to let myself reduce the speed Question 1: Where is it really pricey when it comes to a conversion? Question 2: Is that worth it, since I’ve heard that the oil pressure is causing problems Thanks for your expertise Greeting Mike