What A/F Gauge do you run

i almost jumped on the AFR bandwagon... with a data logger there is alot of info you can get while racing or even just driving. but lets face it, you cannot tell what engine will like what afr, even one is different. instead of spending that 200 bucks on that you can spend that money on fuel for the track and do some jetting changes... or dyno day if your really worried its gonna lean out on you...

all in all... the engine wants what the engine wants...