PM is a private message.......which you can do by clicking on the person's 'handle'..ie; mrmustang, yours is desubguy.....and it gives you options to message, email , etc.
you will get more info here than you will know......they are all good guys, helpful, opinionated for sure, but will set you in the right direction.....I have owned a car that had sb100 and I found issues, but did not do the homework I should have......am now about a week or so away from a new build from my professional friend, and it is a top class version of a FFR. In any case, do the homework, be patient, and you can't go wrong! some of the cars here are really cared for, so, take a look.
HTH.......(hope that helps)
fred z