If you're new...go with the RS4 and get the SS. It's cheaper to get the SS than the RS4 because the SS comes with the two speed. It's not a hard kit, besides, you're just going to end up taking the RTR apart fixing whatever the one who built it didn't build right. You get more satisfaction and bond with your car a little bit more of you build it. Plus the SS has the driveshafts instead of belts. Much better. Look in my gallery and check out mine...it's got quite a few mods on it.