Who said it was limited to 2S?
http://www.castlecreations.com/products/sidewinder.html
3S for the "existing" 4600, so I'd bet 4S is reasonable for the 3600.
ON EDIT....I didn't see that "The MAN" responded earlier today! OOOPS!!! Guess it is just a 2S system. huh......
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES