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Tom:shop dog96 said:I know when I installed drag pipes on my gl1800 (2001) I lost 9 mph on the top in and my gas mileage went from 38 mpg to 31 mpg .
I think it is because I rode the bike harder when the pipes were loader,and I thought the bike responded better and seem quicker off the line,I was soon brought to reality when I race my brother on his gl 1800, witch I out ran all of the time. the light turn green and he smoked me not once but four times,so I removed those pipes and put the factory pipes back on .Now I am back on top.still have those pipes if any body want a pair for there gl 1800 let me know.and I was told when I bought those pipes that they increase h.p by 5% and gave you better gas mileage.When I called the manufacture they told me that everybody's bike was different and that will give a different result