I'd been running a 2-into-1 filter setup since bolting up the Toomeys in 1990 and I ditched that in favor of an OEM airbox, Pro-Flow adapter and K&N style filter. Since I had no idea where all those old parts were, I had to purchase it all new. I'd forgotten what a pain in the ass it was to get the stock airbox in and out and with only a couple of choice words, I was able to get everything installed a secured. The final step was an Alba pre-filter wrap before calling it quits for the day.