Or you could do what I did;
Remove the inserts and gaskets, and cut out all the parts that lie inside the stud-line, leaving some supportworks. Then elevate the inserts with spacers,(I used short sections of vacuum hose), and re-install the inserts without the gaskets.
I got about a half inch. With a perimeter of around 56" IIRC, times two, that totals 56 sq inches, nearly 6 times the area of the throttle valves of my 750DP.Then I built a box between the carb air-horn and the underside of the hood and sealed it all up.
At a later date, I cut a 5 or 6 inch hole in the hood and mounted a small oval aluminum bodied air filter housing on top of the hood (I'm guessing about 7x14) and sealed it to the hood with a V-belt so it's about a half inch up off the hood. The aluminum air filter house has a lip all round it also about 3/8 inch so in total, the filter is nearly 1" up off the hood. I use a filter about 2.25" tall, again guessing. Then I built a different box to seal that hole to the carb. The previous holes are now venting hot underhood air.
I haven't had any negative comments about it, and I wouldn't care if I did. But by the same token, most comments are like: "interesting"....... so IMO that is a thinly veiled negative comment.
But it does everything I had hoped it would...... except in the rain I swap out the pleated paper element for an oiled-cloth KnN.
