I noticed i have an exhaust leak at the o2/dp flange. Both are aftermarket and BOTH HAVE A FLAT FLANGE! The downpipe has a space for the donut gasket which it has, but the o2 (believe to be MAP V1) has a flat flange. I tried using the Grimspeed 3" gasket and its way too small, it doesnt line up the bolts. Im stumped and have no idea how to tackle this without having to replace either o2 or downpipe.