I was wondering, if the engine is getting low power is it the compression, a broken seal, or needs new engine.
Im buying this FC its a N/A and the engine has 131400 with the original motor, I was plaaning to replacing the engine anyway so if it is the motor which one makes the best one to replace it with.

 

Do a compression test. If buying a "new" motor uhh.....hope you are very wealthy. I would go with a remanufactured engine from WWW.MazdaTrix.com they are really great quality with a proven track record. I have had two and they run better then new with stock ports....