Hmmmm i hope they do kits for a few of those, the xl looks killer but they still don't seem to have a pipe design for the buggy and other smaller cars. The most looks like there using a box type exhaust but it could be the battery box. Here's a few of the pics, on the buggy you can barley see the box shaped exhaust.
On the sct looking truck you can see it more clearly, but still not a 100%. I think its the pipe because its far to big to be an electronic box and is made from the same thing the pipe on the savage is.
And here is just the snapshot of the 8cc...
I know i have been wanting a 1/5th scale savage since the baja came out and so have many other people, i feel like hpi went half butt on this one. It is better then the first attempt with nitro and the savage front/rear ends but come on i thought they could do better then this. Still interesting in the xl at least, looks more at home.