Crawlers don't turn very sharp due to the locked axles with no diffs in them, there are mods you can do to get the wheels to turn a little sharper, but to get it to turn real sharp you need a DIG set up. A DIG allows you to lock up the rear axle and only run power to the front wheels so the RIG just kind of pivots on the back wheels so you can make sharper turns, a DIG also has many other benefits as well.