I have and RV-8 in the build process. It is an angle valve IO360 with a horizontal induction and Fly efii system 32 set up. I would like to know what intake/filter systems other builders have installed. I would like something similar to a Rod Bower type 2 set up but not necessarily needing the ram air option. What is available out there or what other styles others have used.
 
Install the RAM air option. Otherwise, you are giving up HP and speed.You can always not use it if you are concerned with burning more fuel but if you don't have it and then want it, you may be doing a bunch of re-work later on and taking your bird down for an undetermined amount of time.