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starting to take shape

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

Well the small K&N when moved to the top of the air box in my big air box mod, added 5hp, the filter is NOT restrictive, it’s location is !

Thanks, that's what I thought. I really appreciate the confirmation, though. At this point I have a new air filter, reputed to have good flow, so I am comfortable just maintaining it going forward. One less thing to worry about.