My tips for it are:-
Open the diff, and shim the outdrives.
Do the same for the bearings too.
There may be easier ways but I'm drilling the ends of the prop shaft, cutting a thread and inserting a grub screw in the ends to lock in the pins. They come loose after a few runs.
Take off the front hubs and dremel a small amount away. Improves the cornering. Out of the box it has a turning circle like HMS Belfast.
Whilst you have the dremel out. Fashion a couple of bits of plastic that can bolt onto the rear tower that will allow you to drop the inside camber link.
O rings could with a change as they don't hold the shock oil in very well. But who needs oil in their shocks!
I will say this about the blast. It is a bloody brilliant car to drive out of the box. £90 delivered! It embarrassed a few of it's very expensive cousins at the local club and in two weeks i anticipate it upsetting a few more at the regional
Hope that helps.