A few guys have found a bar bag does reduce air flow. I have used a high fender and returned to the original and not noticed any difference.

I did a bit of tinkering and sorted my turbulence. Have a look and see if you fancy a go

https://www.xt660.com/showthread.php?t=27601

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I have a lot of growing up to do. I realized that the other day inside my fort.