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exhaust size for best fuel economy for turbo. 700 1988

I have messed with my exhust and noticed different fuel economy for my turbo 745 Bosch system.
The best seems to be just cut off under passengers side. I slipped a long cherry bomb over the pipe clamped down and can see my economy drop. It's a 2.5" inlet also. How can I get the best economy? I have heard 3" helps alot. Any idea's?






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