I have heard the power and sound kit and driven it on the 440i. I will be one of the few voices on here that does not like it. The extra power is nice, but the exhaust sound is annoying, especially on deceleration. It pops a lot and sounds like backfiring. No thanks. It's too bad that BMW will not let you get the power kit by itself for the 440i. And by the way, if you add it at the port, the cost is $3195 + $300 for exhaust tips. Total $3495.
