wow sucks to see we have such a bad rep..
im suprised the OP is seeing so many srt-4's.. i very rarely see them and im up and down the blvd every day and otherwise all around northeast philly, kop, and sometimes bensalem.
so anyway my little story is that i was sitting in a left turning lane at a dead end one day on my way back to the office after lunch, and an oldschool monte carlo ss in the RIGHT turning lane was revving at me.. i ignored him until the third time and then looked over and he just grinned at me like an idiot.. like the OP said.. i dont know what he wanted me to do do..
oh and for the record, if those guys you are seeing have a mopar bov on a stock ecu they blow off constantly, even in vacuum, so that may be some of the extra blowing off you are experiencing