I am looking for input from those in the know about what exhaust brake would be compatiable with a 4" system? I currently have a stock exhaust, but plan very soon to install an ATS 3 piece manifold, 16cm unwastegated turbo housing on stock HX35 (to bring down EGT) and a yet undecided Brake and 4" exhaust. Whose brake is available in 4", and whose system will help me do away with my very unwanted cat. converter? I am interested in a mandrel bent 4" aluminized steel exhaust (can't justify stainless). My truck is a daily driver with either a 2700lb. 9. 5' Lance camper onboard, or pulling a 28' 14K lb. boat. Any help here is much appreciated. Thanks. 
