http://www.cenracing.com/rccarswap.html

Looks like i will be sending in my Nikko car for a matrix pro.... i wonder if they will take that.. its a still considered as a R/C car, right?

"ANY brand / Model of R/C car in ANY condition"
Guess so

go buy one of those micro RC cars for 9.99 and send it in to save $100 on a matrix heh.
You save money and CEN still makes money, so whatever I guess.

On the CEN page it says the Matrix ARR is $200 but on the form you fill in, it says Matrix ARR $250. Would someone like to clarify which it is. Thanks.

I looked at this a while back... I think the matrix pro is arr... but lacks engine and electronics... I just looked here on cens website.. its a bit vague but they show it without radio and electrics... here is the site I was on... http://www.cenracing.com/cars/matrix/matrix.html

matrix pro is a complete unassemble kit. ARR is completely assemblied but no engine and radio equipments

can i send in my duratrax streetforce?

Yes you can. Streetforce is ok.