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These are bearing carriers for the rear of the car. You fit two bearings in the holes, and the axle goes through there. These can be had for around 13 dollars a pair, and are made for the front too. They greatly inprove performance and durability.

These little things are called RPM two stage shock pistons. They are incredible for handling. They allow the shock absorbers to soak up the shock of a big jump, yet also allow it to extend better. I installed them in the front end, but not the back to see the difference. In bumpy gravel, the front wheels stay planted, period. The back was ok, but not as good as the front. See the link below for a full review and installation instructions for big bores.
Ultimate traxxas review and installation

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picture provided by Tower Hobbies |
These have to be the best all around tires. They have plenty of contact for the road, yet they have deep grooves for dirt and gravel. They work great on the front due to the immense side bite, and are also terrific on the back because of good lines.
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These are the big bores i have been talking about. These are aluminum shock bodies and caps, as opposed to the stock plastic ones. They are much smoother, which makes them ideal for racing, but they are also, like chevy, like a rock.

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Thank you JANG for this picture |
The picture on the right is of a graphite front shock tower. It is made by Traxxas for the srt, but will work for a rustler. I installed it before a trip to a place with bumpy terrain, and a few small jumps. I think the front end is much stiffer, and it is a worthwhile investment if you plan on racing. But, you don't really need it if you bash.

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picture provided by Tower Hobbies |
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