*Improving* traction. If tires alone will give you enough traction, then go that route. However, with enough power good tires alone will not hook. With really high power you have to do everything you can to hook up; sticky rubber, good squat, proper gearing, etc.
I personally like the rear end to be really stiff. It handles like a champ at high speeds and cornering..... but this setting is not the best for drag racing.
