There seem to be lots of exhaust threads at the moment, and this got me thinking.
I've had the pleasure of hearing many different after market F exhausts. It strikes me that none of them are perfect - they come with compromises, the largest being drone / resonance somewhere in the rev range.
So, is there an after market exhaust that doesn't suffer from drone / resonance? Is it possible? Maybe Lexus did it right with the stock exhaust.