Brand new (not refurbished) modified ATE power brake booster for use when installing a DOHC e36 / z3 motor (M50 / M52 / S50 / S52) into an E30 3-series 1984-1991.  This booster is a direct replacement for the original booster and requires no further modifications.  The original master cylinder and reservoir can be used with this booster.  It is a smaller diameter then the original to accommodate the larger intake manifold when swapping to one of these larger motors.  

Do not waste your time and effort modifying used and rusty junkyard boosters that are at the end of their service life and provide poor power assist.  Pictures are of the actual booster for sale.  It is brand new.

**Please note this brake booster's application as described is for use in cars with a motor swap, although it will work perfectly fine with a car without a motor swap.  I will not accept returns if you did not read the description of this ad and thought this booster is an original unmodified BMW brake booster that originally came in your car.  If you need further clarification on application, please contact me prior to purchase and I will help determine if this part is right for you.  Thank you!**