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Turbo Aztec: MP decrease when cowl flaps open

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Joined
Feb 12, 2017
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Hi folks,
Flew my turbo Aztec E 1974 recently 13000-15000' above weather and I found something that was strange to me.
Settings where 2350 RPM and 26 MP 15.5 Fuel flow. I did open the cowl flaps halfway because of a few CHT above 400F. When I open the cowl flaps, the MP drops around 24-25.
Also when I climb in higher altitude I find the RH engine MP to decrease.
Is it an issue with the turbo or waste gate?
thanks for you insight
 

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