I am considering buying a mooney that a guy at a near by airport has. I have flown in this older m20c a few times. The pervious owner and the current owner have put every available speed mod possible on this bird. She cruises at 150 kts without any trouble. The problem I have is that the yellow arc starts at about 125 kts, and 150 is right at the redline. Is it safe to consistently cruise at these high speeds in a plane that was not really designed for these speeds? BTW I think the maneuvering speed is like 115-120 kts. the current owner says this is not uncommon for these older moneys with speed mods… anyone have advice or experience with this?