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I am just wondering if there are any outside tuners that dont modify the ECM? On my Motorcycle, and Snowmobile I use a Power Commander. It plugs into the stock ECU and modifies the timing and fuel after the stock ECU so you dont overwrite the tune. I would think that this is undetectable. I am thinking of like a Bullydog or something similar? My Seadoo I overwrote the tune as it is out of warranty anyway and this way seems cheaper and easier. The Power Commander isnt bad though.
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