RB N54/N55 5/16" Thick Head Flange with Inserts Optional Twin Flange:RB N54/N55 Twin Flange with Inserts -$20.00 Optional: For Extra Ordinary Performance

Optional: For Extra Ordinary Performance with JB4 We also recommend Our S55 front mount Intake

4psi Hobbs switch with chassis ground wire and additional 6' ground wire

N55 Stage 1 Vehicle Fitment

The full kit also includes our BOV adapter providing an extra 1/8" NPT vacuum port source

RB N54/N55 5/16" Thick Head Flange with Inserts Optional Twin Flange:RB N54/N55 Twin Flange with Inserts -$20.00 Optional: For Extra Ordinary PerformanceThese flanges are designed with true tapered inlets and backside stress channels (as they were from the OEM's). They are a 7 piece design (single main 5 16" thick flange, six exhaust runner inserts with locators for 1 1 4 Schedule 10 Weld Els). Unlike competitive products priced comparably and made from cheap material, these are billet machined from 100% 304 304L material (with certs). The proclaimed flange of choice for many educated N54 N55 turbo