Ok so my exhaust manifold is cracked. Iam looking at replaceing it with one of the 3 piece units are there any pro's or cons I should be aware of? What brand recommendations. This is a work truck hauling heavy loads 9-12,000 lbs consistantly. 4X4 Automatic. Chipped with Edge Juice with Attitude, soon to have bigger exhaust 4in with muffler.