stock internals for now, i think the tune has alot to do with the motor problems but i do plan to put good crank,rods,and pistons in it soon but i want alot more power too. but i have to find time, full time job,trying to start a performance business on the side and working on my own 8 stangs, its hard to fix it if its not broke and i only have 12800 miles on the 05