Sydwayz

iTrader: (1)

What year are the 496s? Depending on year/serial number, Merc has a recalibration for the ECUs.

Merc replaced mine under (extended) warranty with new CPUs (new calibration programmed) last season.

Cattitude

I'm pretty sure they 2003's, but could be a bit older- I'll run the s/n's with my local merc guy who is a long time friend.

boatfreak

I have an 01 that merc replaced the unit on this spring and a set of CMIs. I always complained about the dirty transom and between the two of them my hiny stays shiny.

Cattitude

so would you do the CMI's again? what did you gain on GPS?

boatfreak

I didn't gain any top end but I do think I have a better midrange. I said this in another thread a few days ago that I don't think in my case that they were worth it. I don't doubt that some of these guys are seeing gains as all boats are different. I would still like to add the Raylar 525 kit to my setup and then I think I would have something. I might add that I have been watching the thread about the air intakes. I have a single in a 28 Active Thunder and I think I recall reading about a 28 A.T. that had a new 525 in it and it was not getting enough air. I haven't thrown in the towel yet on these things as I might still be able to find horsepower.