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I had GAMIs on my P337 and the engines ran fine with them. Ran them at 65% power, 23-24gph total in cruise which got me a TAS of 185 in the high teens with cool temperatures even in the summer with the cowl flaps closed. My P337 had intercoolers, air conditioning and VGs so was slower than some, you might do better TAS wise. The best part was the cylinders looked clean as a whistle when we borescoped them. Never had to clean spark plugs.
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