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Breaking in your car, or more specifically your engine, will increase its power output. It caps at 200 miles though, so people would like to get that done in one step, that way when they drive the car themselves, it has the most HP it can have (stock). Then if you have two cars with an oil change and every HP upgrade, one broken in and the other not, the broken in car will have higher HP. Slight advantage
For your health: http://gtvault.com/gt5/tuning-guide/ PSN - DesertPenguin09 (I always drive with a Logitech Driving Force GT Wheel)