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You can't get a zip for Mario Kart DS! A DS is not compatible with Zips.
Yes it uses 2 wheel drive
it can or you can get it separate, so...yes
Mario Kart.
Yes.
First take off the exhaust by removing the two exhaust nuts at the front of the engine, then remove the two rear nuts near the main part of the exhaust . Remove the plastic cap over the center nut on the rear wheel, then remove the nut and washer and slide or wiggle the rear wheel off the rear spline. Job done.
I don't think there is a kart wheel, but you can start dashing (B or Z) and keep jumping (while you dash) and then you will do a flip in the air :)
The dreamGEAR wheel for Nintendo works very well with Mario kart, and will certainly help you tighten your times.
wheel+wood=cart
Find it at any game store
Yes.