RB N54/N55 5/16" Thick Head Flange with Inserts 320i (F31) If you're running E85 or

If you're running E85 or ethanol mixes in your S55 BMW

Each set is 100% custom-designed from the ground up

0L BMW E92 335xi N55 3

Effective Heat Shield: Blocks hot engine air

2018 AMG C63

RB N54/N55 5/16" Thick Head Flange with Inserts 320i (F31) If you're running E85 orThese 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