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1. Yes and with the JoeZ bolts
2. Have to go to a shop or you could also hit up Invidia because I think they may make an AWD version
3. Does it really matter? If you don't like it, just take it off. Everyone's sensitivity is different to know for sure.
4. Yes, there is drone because you'd be removing a set of cats that muffle sound from getting into the cabin. Tone remains low and I would say no go on indoor voices since at cruising levels with low rpm is when the humming is alive and well.