I had good luck with jetsrus shipping super fast. Both sellers are reputable. Enjoy the mod. Did you decide on that combo based on particular mods on your bike?
I highly recommend hexadecimus' posts and tables on the subjecti, if not yet read. The percentage increase each size jump is telling. Every bike and intake\exhaust combo is different but IMO some are overjetting and over shimming or not reading plugs after. YMMV.
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