Modify stock a55 exhaust
starting from the rear of the pipe, there should be a ridge between the first weld line and the first heat shield mount. you need to cut the pipe on both sides of the ridge to remove that clogged cat converter.
if you masterfully cut that rear section off, then cut on the other side of the ridge, like 3mm over. the cat converter (on the bottom) was removed from between the center peice and the right piece (both on the top row). Ignore that leftmost cut, it was erroneous.