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Don't confuse HP with boost. The HP will be unaffected by elevation where as the boost will change. The MCX 180 kit is designed to make 180 at any elevation. You will see higher boost levels riding at 10 - 12000 feet than a someone riding at sea level but both sleds will be making 180 hp. You will be just as suceptible to detonation as the sea level guy running the same fuel. The only way to truly increase the power safely is to run higher octane fuel or lower the compression ie head shim. In simplistic terms boost just increases the compression ratio and higher compression needs higher octane no way around it. The Nytro might survive up to 220 HP on stock compression with a super or turbo but you'd be asking for trouble IMO. MCX came up with the 180 number for a reason, the question really is what is their safety margin.
M5
Thoughts - I don't thinkl the Push system auto compensates for air pressure like the the MCX. The Push must be set at a certain boost level to work above 6000ft.
This thread wasn't about comparing though it was about upgrading the MCX 180.