i hear they work, sound a little louder then stock but can hold better boost. i know that the bolt holes dont line up so i have seen people cut the holes and heard they can be drilled out....not 100% but it can work somehow
I am running one right now. You have to widen the holes, BUT by doing so you slash the strength of mounting it, so bee careful, because you will snap the flange if you dont torque it down right. Trust me.