Originally Posted by 
bennjamin
				 
			The whiteline kit you speak of , includes reinforcement to suit. 
Currently tho , whiteline is redesigning their kits for better reinforcement so hang in there.
IMO , the biggest handling difference you will get is from upgrading the rear swaybar. Next , would be a FRONT CASTOR KIT. This is a great hidden mod that increases turn in / reduces understeer and increases overall feel of the car.
Dont forget , once its all installed to get a decent alignment ! And decent tyres too :)