As the title says my cat was making the apparently common rattle. I took it to a friend who put it on a ramp and welded the heat shield as there was 3 or 4 bolts missing. Once welded he gave it a shake to check the rattle and it was better but he said it was rattling inside the cat and that i would need a new one. I have an MOT coming up soon so was wondering if i will need a new one or if it will be ok til the MOT (jan). If it would need a new one for the emissions, how much would a new one be? or should i just get a de cat one?