I LOVE the HMF QS that I got, it is just slightly louder than stock and gives the machine a very nice rumble and it took off a few pounds to boot. All the other systems were way too noisy for me (even the other HMF systems) so I went with the QS even though they don't quite flos as well as the noisier systems.
I also have a couple Quiet Cores for it when trail riding with the wifey, she hates noise (although she didn't complain or even say anything after I installed the exhaust so she must not have noticed or she would have most definitely said something). I still need to tune for the Quiet Cores so I haven't tried them yet but I think it might actually be quieter than stock with them in. I will leave this exhaust on regardless, I simply love it.
Just to be clear, I am NOT running the HMF or DJ Tune, I am running another tuner's custom/canned tune and the jury is still out on it.
DJ actually has a couple tunes that come with the PV3 for free and one of them is for the HMF Full system...
- Honda Talon Stock exhaust Stock intake Altered fuel Altered timing Raised rev limit
- Honda Talon HMF full exhaust Stock intake Altered fuel Altered timing Raised rev limit +300rpm
Honestly, I think the stock exhaust/intake and the first tune listed will be the most bang for the buck. It re-maps the stock setup and you get around 6 HP for the price of the tuner (<$75/HP) and a much more responsive motor. Any more gains get exponentially more expensive but the sound of the exhaust was well worth the cost to me so I don't regret getting it (although it was somewhat of a PITA to install, real tight fit where the mufflers are placed).