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Location: OR, USA
a lot depends on ur engine and carb. set up, fuel u plan to use, compression and health of engine, prop size, altitude u fly at, etc. u will have to experiment a little to optimize performance. having reached that state of tune u can expect up to 1000rpm increase.
when dialed in u can really hear the engine come up on the pipe, like it shifts into another gear so to speak.
the fox hawk engines really response to the pipe!!!!