Sway bars on your Stampy;
See how the chassis has 2 tiny grooves just behind the front shock tower and the 2 empty 3mm holes. The grove is for the bar and hardware holes for the hold down screws.
This should be behind the rear shcok tower as well on the diff case. Sway bar kits are readily availible via fleabay
http://toys.shop.ebay.com/Toys-Hobbi...slash&_kw=sway