Remflex Universal 2 1 2" Collector Flange, 3 Bolt Holes # REM8001 Cylinder Head Ring Gear Tooth Quantity:164 tooth Ring Gear Tooth Quantity:164 tooth Easy installation just splice in the new connector to your existing wiring Heating and cooling of the exhaust system causes header and manifold flanges to warp resulting in gaps between the head and header which Remflex exhaust gaskets seal completely due to the thickness and compressibility of the 100 percent flexible graphite There are no rubber binders or composite materials in Remflex exhaust gaskets so they will not shrink or harden due to time or temperature eliminating the need to go back and continually retighten your flange bolts