The drone will mostly come for the exhaust itself, not the headers. If you feel your exhaust currently drones with HFC, LTH will lessen it by changing the engines acoustic resonance. Generally, at idle, the 370 is a quiet car even with LTH and FI catback. So at idle, there wouldnt be any real percievable diference. At WOT, its a little louder. As for the smell... some like it, some dont. I will tell you if you get a lungfull of it youll feel lightheaded. Prolonged exposure behind your car and youll get nauseus. Afterall, the gasses are poisonous and can kill you. But thats not something for you to worry about really, you should just warn the people who eat your dust
