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On our heavily built NC30’s, full on SBK builds we are running stock air-boxes and stock air filters. The only setup that nets noticeable gains (we’re talking 2.5 HP on our 80 HP 428cc engines) is fully open air boxes with either proper ram air and a sealed tank to make a big volume air box or open trumpets and an open tray. Anything K&N ish tend to not make more power than stock and cause running issues on the carb’s bikes. My engine builder is running FI too and going back to stock-ish airboxes and filters until he can find something better. Can’t do open anymore because any crash ingests dirt. Sent from my iPhone using Tapatalk

Welcome back to VFRD after its little vacation. Hispanic Slammer, thanks for keeping the forum up to speed - you're efforts are appreciated. To purchasers of headers: Duc2V4 and I are unable to access PMs at this time, but we are getting email notifications when you send a PM, and we can read what you wrote. Until VFRD is back to being a fully armed and operational battle station, you can email us at vfrheaders@gmail.com. A few of you have already done this and it's working well as a stop-gap measure. K&N's large aperture [big mouth] air filter with part number HA-8098 is the only one they currently make for the VFR800. the big mouth is the filter we installed for dyno testing and tuning of the prototype headers. I was lucky enough to have purchased that particular filter from an individual in the UK for $85. Now the general public can purchase the same filter for $59.99 from K&N. The small aperture filter with the same part number is an old design, and is no longer manufactured. Confusion ensues because K&N on their own website and online retail dealers of K&N products all feature photos of the now defunct small mouth filter. Yesterday I ordered an HA-8098 straight from the K&N website and today a big mouth air filter arrived. I will attempt to attach a photo of the filter that arrived today: