I was wondering if the Injen SRI piping is a tapered design or a constant diameter pipe ?. In other words does the piping start out wider at the filter and taper to the throttle body, or is it the same diameter all the way through ?. Does anyone know the diameter of the piping used on the Injen SRI ?. Just want to compare it to the K&N Typhoon. The K&N intake uses 2.75" piping in a constant diameter design, no taper. Any info would be cool. thanks.