Well I thought I posted this a few days ago but I can't find it anywhere so I'll ask again. I have the 04 CTS with 3.2L 5sp Man. I bought the car with around 89,000 on the clock. It now has 109,000. I do not know the full history of this vehicle but after paying to have the LT side exhaust manifold replaced, the Mechanic advised that I should have the timing belt replaced. Is ther a conversion from belt to chain for this car??