so i\'m gettin new exhaust, are 2 inch duals ehough? i can go 2.5 inch duals all the way back but i'm thinking if the collector on the manifold is 2 inches i shouldn't waste my money on 2.5 inches. i have a stock 350 with a performer intake and carter comp 4bbl carb, now i have some elite ceramic headers but the collectors hang down too low and hit the shackle bolt, and there leaking so i'm going to sell those.. i want the ram horn manifolds but the 2.5 collectors are way more expensive than the 2 inch so how much will it effect my backpressure? will it be better torque? i plan on going: ram horn 2 inch exits, to cats to glasspacks, and from the glasspacks out i want to to 3 inch pipe to the rear. possibly instead of 3in pipe from glasspacks back i want 2 inch pipe with 5 inch tips tucked up by the tank so you can hardly see them.