CAI and tuner questions

I got the DeMolet Tunable CAI and it's installed. According to Demolet, the 95mm inlet requires that it have a tune or the leaner mix will damage the engine. How much truth is there to this? Others say the same thing but I think most have the 82mm (?) inlet How "immediate" is it? Can I leave it on for the few days it'll take to get a tuner? Does it matter which tuner I use. And just how is this thing "tunable" anyway? So many questions. See I have a 68 Cougar that's my toy, and I don't have any of this stuff...
Thanks in advance