the 2.5L isn't a problem. :thumbsup: Just don't go bigger than a 31" tire. 30" would be better. Do you know what gearing you have in your axles? if not, which transmission do you have?
For a 3" kit, I recommend longer lower control arms and an adjustable track bar. If you're short on cash, you could do a 1.75" puck up front and an AAL in the rear. Over 2" and you start to affect the geometry of the front suspension pieces.