BMW G8X FRONT MOUNT SILICONE INTAKES S58 G80 / G82 M3 / M4Description Front Mounted Silicone Intakes for the S58 G8x M3 and M4. Tested and used in our own G80 M3 development car. 3. 5" (83mm) diameter wherever possible. Wire reinforced so they will retain shape and never collapse. We used the best air filter option we could find on these. Unlike some other intakes on the market, the air filters will never be a restriction for these intakes. The sound from the front mounted intakes is our favorite benefit of