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the exhaust on it is the black one from hpi also..im sorr but i dont know the model or part number on it..all i now that its black and its length is from the engine up until to the pulley in front..hehehe.the fuel im using is morgan fuel's backyard basher.20% nitro 16% oil.what exhaust should i put in my current engine?and also could you recommend me an exhaust that would also be good on the os .12 tz so that when i buy that engine,i wont have to buy another exhaust..if it possible.