I got the AFE filter and mount from Mr. Bob and dyno tested it. Yes, it gave more power than even nothing on the turbo. I expect that is due to the shaping of the air flow. AFE has spent a lot of time radiusing the exit, etc. to maximize flow. The K&N RE0880 has a high flow rating, and gave the same hp as no filter at all. The AFE gave 5 hp more than that in my dyno test. K&N, AFE, and Fleetguard all rate their filters at different restrictions, so they are hard to compare. More details in the next TDR, coming out in May. Or see me at May Madness.