Hey pissant, that looks like a nice purchase except for a few things, dont buy a nova head for a stocker HPI .25 engine. Spend the extra 30 bucks and get a Hyper 8port or spend an extra 75, and get a Picco .26 or wasp .26 which are both Bangin' engines! The nova head will see alot more performance when you slap it on those babies.
One more thing, if you are going for looks, the piggybacks are nice, if you are going for durability, they may be better...but the stock shocks rock for racing and bashing because they are alot smoother than anything I've seen in a long while. I have seen the integy piggybacks but not the supermaxx ones, so if they are similar...save your money.