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Hi y’all, i have a gen 2 mazdaspeed3 that is getting a it’s motor replaced, i purchased a cx7 motor online, i know they are basically the same engine gotta swap harness over because of auto transmission from cx7 and all that, but anything else that will need to be swapped over? i will be...

I recently bought a Mazdaspeed 3 that has a bnrs3 turbo and it smokes out of the exhaust occasionally usually when I let off on the throttle and when I shift, also sometimes when I am idling at a light. I don't really know where to start but when I got back home one day I noticed that there was...