Well, when I first got the car, the turbo with the stock tune had a sort of 'on/off' feeling to it. My wife generally gets car sick if the car doesn't ride very well, so I took just about every opportunity to go from off to on (and back again) when she was with me. After a few rides, she kept suggesting we take her car, and when I asked her why, she told me it wasn't comfortable in my car. I told her I will fix it for her immediately.
1 Stage 3 TP tune later, she loves how smooth the motor is.
She also has complained recently about the body-roll... Rambo just gave me the BEST IDEA EVER.
See, after being married for 10 years (together for over 17), I've learned it's all about framing the situation in such a way that you are doing it for her (or the kids) - because you love her (them) so much, or because she suggested it. The key is to keep her oblivious about cars and that sort of stuff, though.