Originally Posted by Geoff-AU

I am very sensitive to drone too (HATE it) and the HKS Hi-Power suits me perfectly. I have a manual but there was a comment on here that took pains to point out the HKS had zero drone at any RPM and at any load point. They were spot on. I haven't even insulated my boot area, car is 100% stock just bolted the cat-back on.

All exhausts are known to get louder with HFCs so YMMV if you go ahead with those.

HKS Hi-power is almost silent as stock if you are in the first 10% of the throttle range and below 3000RPM. But as soon as you put a bit of load on it comes to life and makes a nice, noticeable note (it's a lot louder outside the car than in the cabin though, which suits me fine). But no drone.