ProGuard 7 Intake System
I installed the ProGuard 7 Intake System along with the Pre-filter (purchased from Geno's Garage). I also, removed the silencer ring at the time of installation. I'm happy with the performance of this system. The truck seems like it breathes better and get's up to speed faster. It's nothing dramatic, but you can feel a subtle difference. I also, like the sound of the turbo now with the ring removed. There was a post on here awhile back regarding how much better the ProGuard 7 breathed than the stock system. I may be off a bit on the numbers but, I think it was 350 cfm for the stock system and 698 cfm for the ProGuard 7. I had a K&N in my old truck and removed it because it let in way too much dirt. The ProGuard 7 is supposed to be far superior. The Pre-filter is a polyster cover (sock that fits over ProGuard 7). The label says "This unique material contains uniform micron openings that stop dirt or debris . 005" or larger, however air flow will be slightly restricted. " I live in the desert and we have a lot of fine dust in the air. From what i've heard about this filter system, it looks like the answer, to me. Hope this helps. Joe Fihn (Buffalo). Phx, Az.