Stage One BMW Speaker Upgrade for E60/E61 Sedan/Wagon with Standard Hi-Fi TIRES or Walbro 535 fuel pump(s)

or Walbro 535 fuel pump(s) capable of flowing up to 350% more fuel than the factory fuel pump and all options are 100% E85 compliant

Plug and play connections: Yes

they're also built for upgradability

Color: Blue

1:1 Boost reference regulator

Stage One BMW Speaker Upgrade for E60/E61 Sedan/Wagon with Standard Hi-Fi TIRES or Walbro 535 fuel pump(s)GET UNBELIEVABLE, CRYSTAL CLEAR SOUND. JUST BY REPLACING YOUR BMW'S SPEAKERS We took your factory BMW speakers and re engineered our upgrade for one thing: clarity. So you can simply swap your original speakers for ours without changing anything else in your audio system, and the result is smooth, natural, yet unbelievably detailed reproduction of your favorite music. PLAY YOUR MUSIC LOUDER. AND ENJOY EVERY NOTE: We engineered the Stage One speakers