I have installed the k and n off road kit , it takes about 30 minutes to install . There is one issue with the 'L' bracket , it need to be turned upside down or hood will not close properly.Once the kit is installed there is a better sound inside the car , you can really here that thing sucking air . The seat of pants is probably really not there. I think because you here it , it might make you think you are going faster. On my 0-60 runs i picked up maybe a tenth. I was getting 5.1 before and now hitting 5 flat. Other then that its a nice looking piece , that i will keep.