It is smog legal. If you're light on the foot it's surprisingly quiet. I never got harassed for it over 3k miles and I was going to contest any noise ticket since last I heard they literally have no facilities for testing the dB level. It's right on the borderline of being too loud.This came with my 15 GT. Really fun exhaust, I thought this wasn’t legal in CA due to noise restrictions. I use to live in ca.