I've heard/driven a FiST with the Cobb intake before and I think it's relatively loud compared to stock (a decent amount of blow off noise IMO). My preference is for quieter vehicles oppose to obnoxious, so my perspective might be biased. I'm sure Cobb might actually be quieter than some other systems out there. It was fun for a bit, but I felt like the Cobb unit was annoying after a while. Anyways, I would say explore the Mountune option.