E53 4.4i intake dilema

[ihvabmr]

I'm fairly new on this forum, so please take it easy one me on mods or what not. Anyhow, I am thinking about replacing the OEM filter with the K&N replacement. Although it only yields minimal hp, in addition to let the engine breath a little easier, I've had pretty good experience with them with no issues or what so ever. During my search to explore other options other than K&N, I've come across AFE intake system, which, consists of a cone shape filter with heat shieds, and their version of the intake elbow. I am just curious on the effectiveness of the this particular system so the $200+ isn't just thrown away from AFE's marketing. Please share your thoughts and input. Should I stick with the K&N replacement filter or AFE system? Thanks very much...