all i have now is a dc4-2-1 header, a hollowed out cat, and 2.5 in piping to an apexi n1 muffler. I also have nology spark plug wires and bosch platinum plugs. I got a set of nice gsr wheels from japan that are hot......im gonna go as far with the stock engine as possible since nobody else has really done it with a 1.5 liter yet....let me know what i should do next.