yep thats basically the reverse of what im going to be doing. The reason your downpipe bolted up is that the cat is in the sameposition on both the MA70 and the JZA70.. but the downpipes themselves are different.. what im trying to do is get as much of the MA70 exhaust/downpipe bolted up to the 1JZ engine as i can... basically following the route going from the back of the exhaust up to the engine.