Thoughts on this upgrade for a 525 EFI?
 

http://www.cpperformance.com/p-26619...y-525-efi.aspx

Who does the programming?

Think it really yields that power?

Looks like you get a new ecm with the programming done, exchange on the throttle body to, bare heads ? I don't see any valves, springs, retainers in this package. Personally I would put a custom grind cam in them also. The 500 & 525 intake plenums will stop flowing air at around 5500 so it doesn't matter how much CFM the TB flows it wont make any more power, jmo

Keith, shoot a message to REMEDY here on OSO. He's got a great plan that works on the 525s. He's seen nice upgrades on his 33 and a few other boats he's done it too.

Is the few mph worth increased drive issues????

Will only a few mph even satify you or leave you wanting more???

You do not need a custom cam grind there are several well known engine builders that offer a "package" similar to what's listed that will work great for you.

I'd spend a little more and add over 250 hp (and lots of broken bravos!) Either way requires 91 octane.. https://whipplesuperchargers.com/ind...&product_id=56

Am I missing something or do they not quote specific numbers other than "increased"? How much HP does this kit produce?

It says as much as 75-80 hp increase. Now my understanding is that most 525's make 550-560hp.... So is that really 45-55hp increase? Is the HP measured at the prop? Isn't that how merc rates them? 7k for 45-55 hp? How much MPH can one exspect to gain from 55hp per side?

...about +2 MPH

$7,000 per engine to net 2 mph and the need for 91 octane is nuts! (JMO) One of the best things about the 525 is that it likes cheap 87 octane.

I have been weighing options and talked to Eddie Young about this kit versus Whipple. The payoff for doing this particular N/A kit, and having to run 91 as 3rd pointed out, just isn't worth it IMO. I have come to the conclusion to swing for the fence (Whipple and run 91) or leave it alone, maintain to the highest standard and enjoy availability of 87.