I just put manifold back duals on my stock 318-2bbl, 87 Ramcharger. They are 2-1/4" with turbo mufflers and no cats. Would I benefit any by putting a cross-over pipe in it before the mufflers? I have read that it helps produce low end torque and better milage. I think I lost some MPG by switching to the duals over the stock single exhaust, but I think partially because it still has the lean burn system ignition.
What do you think?
What do you think?