Hate drone but it's worth it for my HKS 75mm/Hytech 3" test-pipe. It sounds so sexy and it's 3".

 

The best way I can describe it is noise transferred inside the cabin vs out of the cabin. It will make your ears ring if it is bad enough. I know the t1r 70-em dual that I had did this as well as loosened a ton of bolts on the car it was so bad.

 

The Q300 has a slight drone but it isnt what I would consider a problem, non existent if you stay over 4k rpms

 

my q300 only drones between 2,000-4,000 with light throttle.
a bit annoying but not very bad but it's there. i also have header and HFC though.
isn't heard on the outside.

 

Drone is caused by resonance of the exhaust piping. To me it feels like it's blasting the cabin and I can feel the whole car shake. I know some people aren't sensitive to those frequencies (usually ~100-150 Hz) so that's why you get different reports of drone from the same exhaust.

 

My SE single drones...but well worth it for now!

 

My SE single droned until I added sound deadening on the passenger side and trunk, it's very livable now

 

ride in a LT1 camaro with flowmaster super40s. THAT is what drone is. It pulsates at a frequency that somehow seems to vibrate from inside the cabin out. At the worst, it feels like your heads in a balloon and someone is squeezing it at a constant frequency. My drone test is simple. Install two (good) 12" subs. Have it at half power - if your music still sounds like theres no bass - your exhaust f'kin drones.

 

Can be a bit annoying at certain times (especially downhill engine braking), but 90% of the time my drone makes me smile... cause I know what's going to come out of it if I give it gas