Welcome to the forum. The Aftershock is a great SC Truck. The 3.5 has loads of power. There are a few upgrades that you can do but by far the best to do on that truck is the MPO-11 Steering link and the MPO-02 C-Hub Carriers, You can also upgrade to the Steel Spur Gear MPO-016. Have fun and good luck with your new truck.
http://www.urchobby.com/proddetail.php?prod=MPO-11
http://www.urchobby.com/proddetail.php?prod=MPO-02
http://www.urchobby.com/proddetail.php?prod=MPO-016