S38 / M88 Intake Boot

5 Ply 4" to 3" Silicone intake boot for you e24 or E28 M car

Price: $60.00
Intake boot color



  • 5 Ply reinforced silicone
  • smooth interior improves flow
  • oil resistant
  • easy installation


Our GEN III/M MAF has a 4" diameter. The factory intake plenum opening is only 3". This 4 to 3 inch adapter is for the e28 M5 and e24 M6. A benefit with this made to fit boot is less turbulence; the 4” to 3" silicone reducer boot is smooth compared to the factory 3” corrugated elbow.