a better option is AAM for me personally. Aircraft Airfile Manager.
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For what it's worth. Contact Carenado and ask if you can use their Beechcraft T-34 sound file. The sounds are rich and throaty, and it (sound file) should serve until you can get an accurate MFI-17 sound of your own. Anyway, that's what I would do.
Good morning! Roel is absolutely right on everything said. And since your plan is to utilize the IO-360, a Cessna 172 sound do. Keep in mind that the 172's cabin sounds will be different (quieter) than the MFI 17's. That said; just a couple things. The (Super Mushshak) see: http://en.wikipedia.org/wiki/PAC_Super_Mushshak uses the Lycoming IO-540 V4A5 6 cylinder 260hp engine @ 2700RPM. My including this information now, is not my attempt to confuse of distract. It is only an attempt to inform and justify[?] the fact that this old guy really likes the Carenado T-34's sound. Again, Roel is absolutely right and a quick solution is the Cessna 172 sound.