1. Yes the idle is lopey. If you are not used to that don't get it.
2. What do you mean drivability?
3. Say goodbye to passing emissions.
4. What kind of a cam is it? NA? Turbo? Nitrous? Specs?
which engine? If the v6 Ive heard it is slightly lopey nothing crazy like old muscle...it should be perfectly driveable with some adapting. Dont expect good mileage id say. I would have my hands on a set if they were within a reasonable price for me
Not lopey at all - even cars with stage 3's that I've heard don't even sound modified other than dee, deep exhaust tone. All depends on tune. My car idles smoothly.