If it helps:
I was running a 13x2 on nickel batteries in my 501x and am now running a 8.5 brushless on lithium batteries in my 511... assuming the chassis' perform similarly (and they do) I can assure you that an 8.5 brushless is way faster than a 13x2 brushed!
I suspect 8.5 will be well sufficient for your Dark Impact, at least to start with. I have no idea how people use 6.5's on a small track… they obviously have skills that are way, way, way beyond mine lol, I'd just destroy my and every other vehicle if I tried that at the moment!
I'm also running the Intellect 4200 LiPo saddles and can confirm they fit into the 511 just fine, as a result I'd expect the lower capacity ones to present no problems fit wise.
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