LOL... I am not much for engine covers. Mine adorn the wall in my garage. Garage art if you will. I never would take the time to compare CAI. I liked the design of the single and purchased it. I was running 12.8 at the track at the time. I gained a couple of tenths right from the start. Low end was noticeably better. Butt dyno. Later that year I attended the Dream Cruise and Rob updated the roadster to the dual. I went right back out on a quick run up the interstate, and the low end seemed to be even better. That next year at the track we were down another 2 tenths. So, if 10ths of seconds mean something to you, Robs CAI do what they are supposed to do. Improve performance. I think they look good too. What some of you forget, before ROB became so busy, he was at the track running his coupe too. No car guy who is into performance wastes their time or money on something that doesn't perform. The "professor" as I like to refer to him did a lot of testing on the dual before Rob adopted it. I will go with the proven performers every time.