I think it is the same as the h2e except it has a clamp plate compressor housing instead of a v band not 100% sure though,with a 17 exhaust housing it was still streetable a lot of people ran the 2e a couple of years ago until the pro 52 came into the picture.I think the 2e is a 2.6 but not sure,I do know they take a lot of abuse and keep on running.