I have an 85 Chevy K-20 pickup that is in need of an entire exhaust system (all original except muffler and tail pipe). It has the HD 350 engine, 4-barrel, 3 spd auto and 4:11 rear. A buddy of mine has the same truck and says that he got a lot more power and better fuel economy when he swithched to dual exhaust. If I'm going to do it, now would be the time. Do you guys think it would be worth the extra cost? Will it really make a difference in performance and economy. The truck only has 73,000 miles on it and is in pretty good shape. Any comments would be appreciated.