Yupp. You take some sheet metal and put some bends in it. Make it out of cardboard first. then lay that flat and cut it out of metal. Mounts up under the front tank sides.
i think he means for on the carb... in which case, they sell stuff for that and it would be a heck of alot easier to just buy it... and then it would be high quality...
OH, hahahah. Yeah, your gunna want to get the pro flow kit or something similar. But you say you have a K&N already makes me wonder. you have a stock air filter K&N or one for the adapter?