Mine was worse than the OP's. When I placed the flange on a flat surface, I can rock it back and forth like a rocking chair.
The flange must be flat period. Any unevenness will cause a leak. When the bolt hole area has a gap, torquing the bolt would cause another area to raise up.
The gasket is only for microscopic imperfections that cannot be felt or seen. A gasket wont be able to seal a big gap like that.
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GTM Twin Turbo Stage 2|GTR Turbo/Engine Gauges|KW V3 Coilovers|HKS Exhaust|Oil Cooler| Vossen CV1
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