I have had my slash 4x4 for a few months now and I'm thinking about upgrading to lipo. I think I will be getting the Gens Ace iMars charger and the Gens Ace 5000mah 3s lipo. I have used my friends 3s on my slash (it was like $130) and I loved it. I also used my other friends 2s lipo. I think I will definitely get a 3s. My questions are if there are any other cheap but good quality 4500+ mah 3s lipos. Or any better chargers that are cheap. My friend said you need metal driveshafts but when I used his 3s the plastic ones were fine. He also had a 9 tooth pinion and a 54 tooth spur so he had a ton of torque. I was just wondering what I need to upgrade.