Well since there has only been 2 people on here that has ran nitrious I would not say that the Mazda3 does not like it. One tranny has said to be gone because of it, which I kinda doubt. I see the engine being very strong, alot stronger than the 2.0L Zetec in the Focus and the 2.0L in the Protege. Not only that it takes very well to mods, in fact better than most 4cylinders. I just don't see you putting down 200hp on a 75shot. I say what happened to you was either a bad part that MAYBE got worst from the nitrious.