Turbo of your choice (T3 or T4 from BW, Precision or Garrett) Cast Exhaust Manifold (divided for twin scroll), non-ceramic or ceramic coated options, single wastegate port (fully divided), O2 bungs (N54 version) TiAL MVR or Turbosmart Hypergate wastegate (you may also choose to purchase the kit without a wastegate). Jpworkz BMW aftermarket turbo kits 900hp. Get In Touch. Home; Shop; Contact; Turbo Kits. BMW N54 Top Mount Single Turbo Borg Warner. $2,899.00 BMW N54 N55 Top Mount Precision Single Turbo Kits. $1,000.00 Top Mount Twin Scroll Single Turbo Manifold. $1,199.00 BMW N54 Single Turbo Bottom Mount. $2,599.99 BMW N54 / N55 Hot Parts Kit Full.