Just to clear up the speed thing. The article I had posted had a comparison chart between the EK4, Moster Pirate and the older T-Maxx with the .15.
Speed went like this
EK4 37.55 mph
Monster Pirate 32.28 mph
T-Maxx .15 29.05 mph
Thats pretty good considering the single speed transmission on the EK4
I also found out that they make a 2 speed transmission for the EK4. If it goes almost 38 with a one speed it wopuld be ungodly with a 2 speed. Here is the link for the 2 speed tranny.
http://www.rcmodels.com/rc-hhh-ek41021.html
There also seems to be more parts out there than I expected. Here is another link to parts.
http://www.rcmodels.com/rc-ttr-6216-f.html
The new T-maxx with the trx 2.5 engine is said to go around 40 mph according to several articles and traxxas. It is still a .15 engine still but produce 60% more power than the old T-maxx according to traxxas.
Just general information here:
The latest issue of RC Nitro magazine(April 2003) has a shootout between the T-Maxx and Savage. They got the new T-maxx 2.5 up to 40mph and the savage up to 32mph. The T-maxx also won the drag race against the savage.
I doubt either could drag race a EK4 and win if they were all stock.
Good luck and I hope this helps.