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I am sorry dude, sounds just like the "rod knock" I had. I can't tell you what it was for sure since we never opened the motor up to find out. I found a well priced 2nd hand FA20 and threw it in over a weekend with a mate. Almost certainly the header install had nothing to do with your failure it is just coincidental that it happened after the install.
I'd hazard a guess that if you weren't comfortable installing the header you won't be looking to swap in a motor either. Make sure you get a few quotes whichever direction you decide to go. Given the hack job on installing your o2 sensor I wouldn't be rushing back to the guys that installed your header.
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