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The 850-T, like the V7 Sport, didn't come with an airbox, just a rubber plenum with a screen at the bottom. What pod filters you use depends on what "velocity stacks" you have. Some information here: http://www.thisoldtractor.com/moto_guzzi_loopframe_air_filters.htmlMy favorite is these stacks:http://www.mgcycle.com/index.php?main_page=product_info&cPath=279&products_id=3201with these filters: http://www.mgcycle.com/index.php?main_page=product_info&cPath=164_166&products_id=1907
These are what I'm running. I can remove the velocity stacks and probably machine an adapter for a pod? Or is there an actual pod that will work with the trumpet velocity stacks?
If you go with pods, you might consider Uni foam filters. I changed to them on my Mille, which had K&Ns on it when I bought it, after reading some test results on effectiveness of filtering. They often come with a red prefilter on them, but for street use you can remove those. I had to do that to get them to fit.It looks like you can cut off the stacks to make them into pod mounting flanges.
In my experience only with inline 4's, air and oil cooled.Pods on carbs are not the greatest.Pods are more susceptible to atmospheric changes as well as heat build up behind the motor.This means your jetting is not as good for a larger range of intake air conditions.A plenum therefore is much better.On Guzzi's: no experience.