OK, so I've read all the threads and talked to everyone I know. I am getting a P0420/30 error code and a rough idle after my boss manifold install. Ive had several re-tunes from steeda (through Stage 3 Motorsports). Everything kinda points towards a vacuum leak somewhere. I have taken it off and re-installed it with same results. A very rough idle, to the point sometimes it will stall and die. During install I realized that you cannot torque bolts down near as tight as the spec calls for, if you do the snap long before. Is this the problem? Who out there has been through this, any suggestions welcome.