I had bought the 2 bolt version of this uppipe before hand and was extremely happy with the Quality that i clearly had to buy the 3 bolt version once i had bought a tomei UEL header. The flange is extremely thick as well the pipe itself. it comes with studs for the top as well as the nuts, gaskets top and bottom and the hardware to bolt it to the header. my only real complaint(which isnt one towards grimmspeed) is it is a little harder to install the tomei 3 holt header with the 3 bolt design. the flex coupler did help but what i had to do is slide the header up and while my buddy held it in place i put a bolt in the top one while it was tilting the uppipe down and loosely held it in place. it also was a little difficult getting the flange throught the stud because the flex coupler was right there. After a little time and once getting it past that it went in quickly afterwards. Again that obviously has nothing to do with grimmspeed but figured it may help the next person going.