All u need to do is find an experinced welder. imo cut and weld is garbage and who ever did the b serise in the first place w/o SWAP mounts is stupid,.
But here in plant city there is a place that can re weld it for u , a freind of mine had cut and weld in his car and they redid his. the place is called Huff muffler 813-752-0189.
~jake