I'm now installing a Stratus 1090 OUT in my 337D model. It will be finished this week. It's costing $4K. I did not have a WAAS source so I went this route. I have a 530 and a Garmin 330 transponder. I figured by the time I upgrade the 530 to WAAS and the 330 to ADS B out I'm not gaining much and I wind up with an old GPS and an old Transponder, for more money. This way I can fly until the 530 dies and up grade then. My dealer took the transponder in trade. Net $4K
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