Well, I have the ATS and Piers turbo installed. It wasnt bad except for a small leak in 5-6 cylinders. It was easy to fix though annd it is on now with no problems. I did notice an increase in low end go power but I would think that is due to the turbo not the manifold. I have not towed with it yet but that will come this weekend. The whole job took about 3hrs. The ATS manifold is about 50% heavier than the stock. It looks really cool on the engine. I will up date any lower EGT's when I tow, Dave