My StormerHobbies MRT came in the mail today, just in time for Wed night racing and it worked flawlessly at our local tracks RC4 system.

I happen to have a couple older MRT's that I'd like to upgrade but I'm a little confused with the OP.

Can I simply trade both of them in straight up, or must I double up my count?

Do I need to pay £49 to upgrade both of my old MRT's or does that £49 get me 4 in exchange for my 2, or do I need to pay £98 to get 4 back... so confusing