OS.21 for a revo

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I am going to be picking up a new os.21 for my revo and was wondering if these are good engines to have modded. I dont want anything crazy as it is going in my daily basher revo. I just want it to make decent power and be super reliable.

Also I would like to couple it with an ERCM pipe and use a side exit exhaust on the revo but am not sure what header to use.

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