I wondering if anyone has or knows someone who has done an ECU upgrade on a pro xs? I been reading Simon motors and magnum tuning with mixed results. Some claim 15-20 hp gain and better performance all around while others say no difference.
Mercury upgrades
- Thread starter watson
- Start date
Can't say on a merc but it was well worth it on my F150 Yamaha, had it done a couple years ago, engine runs better all around and gets way better fuel economy. Smoother power band throughout too.
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