Jamie/Other experience RB engine owners - I'm getting an 8th buggy soon and am in debate between two RB engines and also a Novarossi. Is there is significant different between the RB S7 L2G vs the RB S5 L2s? Is it just that one is a 5 port and the other is 7 port? If so then the S7 isn't worth the extra $40 spending no? For the price of the S7 at my LHS they also have a Nova RX21 P5 and was wondering of the overall performance for the two primarily which is more consistent. Surely both are powerful, I know that.