I'm sorry, I misread your message. That's definitely a good question to ask. Everyone's ear is different and what may sound good to some and not drone to them, may be something you don't like. I have been working with aFe letting them use my ST for their R&D process for different things. They're coming out with a catback system (in the new year) that I happen to really like. I was originally going to put the Thermal R&D exhaust on, which is why I'm selling it now, because that is another great system. Just remember that exhaust sounds are personal preferences. What someone may love, others may hate. For me, I'm happy to wait on aFe getting their exhaust out because I was their test vehicle and got to sample it for a bit. I got to run it through it's paces and for my driving it works out perfect with no drone and I like the sound. Others may think differently, again going back to personal preference. Good luck with whatever choice you go with and there are some amazing people on this site who have been extremely helpful with their inputs for me at least. With exhaust, what will matter most is if YOU like it.