421 serval won't rape "everybody" in the drags, but it will put a hurting on the 4-strokes as long as your chassis is set up right. I went from a stock shee to a 421 serval with stock chassis and it ran ok and was a blast. then went to 421 serval with a lighter frame, +2+1 arm, +4 swinger, lsr axle and elka shocks all the way around and let me tell you, it was life changing. I hook soooo much harder now so much more stability I destroy my friends craptors and yfzs and I can fly through the trails so much easier and faster than before. I am very happy with what I have right now