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I contacted Mishimoto customer service, and they were very helpful about getting a replacement part. I elected to pay for expedited shipping as I needed to get the car up and running as it's my commuter. I tried verifying the torque spec with them, but the guy I spoke with said he had no idea what it was supposed to be.
Once the new collector arrived, I compared Mishimoto's installation guide torque spec to a few other installation guides I found online (Perrin's calls out 25ft-lbs), and they were all pretty close making me suspect my collector was faulty. Starting at 10ft-lbs I started incrementally tightening the bolt to about 28ft-lbs (I was still a little nervous), but this time it held up. I added some oil and primed the cooler (flooring the gas while turning the key turns the engine over without starting).
After starting the car and taking it for a drive, I checked for leaks and didn't have any. I took it out for a quick spin to open it up a bit and rechecked. There was some leakage at the sandwich plate, so I tightened things up a little more.
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