Installed on my 94' Civic EX with a D16Z6 in it. Simple bolt on setup that is compatible with stock cats and aftermarket pieces. The finish was Nice even after the break in period for the ceramic. Stayed shiny and has a mirror like finish. Of course the O2 sensor had to be lengthened though so it could be put into the sensor socket at the back of the header. Came with all gaskets and bolts required - reused the stock header nuts/studs on the head. Definitely made a difference in the midrange on the car. Oh yeah - It's CARB approved(has a EO #).