Same thing happened to me when I installed my secondary cat bypass pipes. Just find an expendable bolt that's the same size as the hole in the flange, and pound out the stud with a hammer against the bolt. Try not to hit your fingers while you're holding the bolt. Hit it like you mean it. It will come out.
Alternatively, you can take a die grinder and grind off the head of the stud, then pound the stud out from that side.
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2002 Boxster S, 6 speed, Speed Yellow
Flat Six Innovations 3.8L Stage II Track Performer, RoW M030 Suspension, B&M Short Shift Kit, Fabspeed Bypass Pipes, FVD Brombacher "Sound Version" Muffler, UD Pulley, Low Temp T-Stat.
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