Scar,
I don't mean to put you down AT ALL but you are sooo confused.
The Dyanmite Racer is the same thing as the ABC DTM. Basiclly a scalled down pan car. It is a 1:24 scale (the size of a typical plastic model). It has a ball differential and foam tires. The chassis is a thin piece of fiberglass. The electronics that come with the Dynamite version is CRAP!!!! If your are serious about this car, go with the ABC version. They have a new one out called the ABC DTM SP. Typically people run 6 cell packs and either 130 or 180 size motors. The 180 size are the same the HPI Micro RS4 uses.
There is a whole sub fourm you can check out on the ABC.
The Epoch is 1/43 scale. Basiclly the electronics are propriatery. You really can't just stick another steering servo in their or eneything. You can add cells as you may have seen in other posts.
With the ABC you can use REAL electronics and it goes VERY fast. The Epoch is much more of a toy than the ABC. BUT, I would really reccomend against the Dyanmite car. It really is a recycled version of the old DTM car by ABC Hobby.
If you are still confused, please ask. BUT, I do encourage you to do some looking around on the ABC fourms too.