I dunno....should I be running restrictors? I have a solid roller cam, and a set of crower hippos. I have to admit I don't even know WTH they go. I have my intake off at the moment thought now might be a good time to figure out if I have/need them. As far as max r's I'm only 5500 on a good day. I want to be able to idle and pull kids ect. without worrying about the cam. If it matters it's a mark 4 bowtie tall deck. Thanks in advance for putting up with all my rookie questions.