Download the sound clip and listen/watch it. I love it!! Deep throaty low sound. Pretty quiet when in idle or normal driving. When you gas it it's not too loud either. Nice and stealthy! It was $650 for a phase 2. They painted the reflector housing black, installed the projectors and provided hella ballasts with phillips 4100k HID bulbs (D2S base). I opted to stay with the 4100k bulbs rather than the new 6000k ultinon bulbs because you lose the blue/purple "flicker" that on coming traffic sees at a higher kelvin rating. I'm very happy with them, it's a bit pricey, I know, but I drive at night all the damn time and I love the output of the S2000 projectors. For me it was well worth it.