A plus side to the H pipe being removed is, it helps keep the R/R (rectifier/regulator) from getting too hot.
I wouldn't let it stop ya from getting the bike. Mines been off since I got the bike. Never had any troubles. Some people say it drops some of the low end power. Since mine was already off when I got it, I don't know, but the bike seems to have plenty of power to me.
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC