I have the Carnage which is an amazing basher..one day might get the vantage.
One of the first up grades I got was the
anti-sway bars which really improve the handling so I think that would be a great choice and a cheap one.
Another nice thing to do would be to give the car a personal touch just for him and find a nice new body shell for it and get it painted or paint it together as a project. I think the phat bodies
Gohuwj for the b4.4 will probably fit...
And of course, can't go wrong with a new motor, you kinda have to replace brushed motors every several races anyway.
J