Vibrant J-Spec Exhaust Manifold Outlet Flange Kits are designed to simplify the installation of any manifold with a 2-1/2" diameter outlet. This kit consists of a 2-bolt connecting flange (with a flared outlet neck) and a 2-1/2" I.D. donut style Graphite Gasket. This flange kit will work with OE or aftermarket Spring Bolts. Note: Center to Center measurement on the 2-bolt flange is 4-3/4" (120.7mm)