My wife (I'm 58, her 55) has always been cool with what I do with my cars, be it stall, tune, long tubes, drag radials........however.......one night a buddy told me to watch a video on youtube where an intake was blown off a Mustang and she happened to be watching it over my shoulder. She asked me what happened and I told her something about nitrous. Her, being an ex-nurse, all she had to hear was nitrous and that's all she wrote. She looked at me and said, "it's a good thing our car will never had that stuff on it." and walked off.
Being married to the same lady for over 27 years I know when to back off. You have to pick your battles with the wife and this is one I couldn't win.