So far the Invidia Q300 is doing well with my 2015 Civic SI. The sound of it is not too loud especially when you're inside your vehicle. There is a little bit of drone but you really can't tell unless you pay attention. I'm recommending this part for those who are not looking for too much attention from the cops.
I had this installed for past few weeks and so far it's been GREAT. I LOVE the sound on my FX35. It produces deep low base sound without being too loud. So far quality seems to be excellent, my mechanic had no problem with the installation, it fits like a well made suit on my FX35 AWD with tow hitch! Auto Anything provided EXCELLENT customer service and they matched lowest price I found. This was my first purchase from Auto Anything and they now have my future business! You guys ROCK!