You guys make my face brain hurt.
From my research and from running a 50/50 and VTA on my car (even a crushed stocker would not hold my only 26psi), there is zero ill effect. If you have cats and run a VTA for 8 years you might cause premature wear on them. For the amount of time your car runs rich ( I will log it Friday) you might actually cool the engine a little lol. Running rich is not the problem imho, running lean is a problem and a VTA, as long as it functions properly, will not cause the car to run lean. I will log a 3-4-5 pull and regular city driving with a Turbosmart supersonic VTA and post the AFR results!