I've been researching them off and on for a few years - which seems crazy now in retrospect. I am also "2 G or Not 2 G" on the G35/g37 forums and have started threads and participated in others there asking various things about FI exhausts like one asking for before/after db readings, which Tony participated in. I started that thread specifically to determine how much volume i could expect from FI compared to stock. Some other manufacturers have these before/after db readings in the form of youtube videos whcih works great for that. In that thread he was shown how DB readings would need to be taken (someone quoted from a law on how the state would measure it) and he mentioned that now he knows how to do them, but I don't think those DB readings were ever done by FI. That kind of info can help prevent people from getting something other than expected.
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