Its a combination of struts and springs. What are you using now, I hope its not stock with that much power? And yes you will break something if you keep launching that hard. Z and ZX's were not made to launch hard this ability is designed into the suspension, our cars are designed to keep the weight centered and turn not transfer weight front to rear like a dragster. You've got to add stiffer rear springs and get struts that have a slower rebound than dampning. The springs will determine how much weight is placed on each tire - the more weight on the wheel the less likely it will be to hop up off the pavement, the struts control how fast or slow the movement happens. To really make it hook up, you'd want to install struts in the front with a fast rebound and slow dampning to let the front end lift then slowly settle back down - transferring more weight to the rear tires.
If you want your car to handle, then don't do this, I mean it won't be horrible and it will still handle better than alot of cars but not like its designed to. Hard launches don't matter in the twisties where its all about maintaining momentum.
good luck
Matt
