It was only £7.99 posted for the cone filter I bought that was big enough to fit the MAF plus won't you have to insert some rigid tubing into the end of the silicone pipe for the cone filter to clamp to?
Barry
i doubt theres a pukka back to back comparison anywhere but id vote fitting a panel filter then chopping the bottom of the airbox off, and smashing a cold air feed or two up there would be better than a cheap and cheerful cone filter.