This isn't a question about will an exhaust manifold leak will cause knock, but why or is it false knock. Since I am stubborn and no matter what used the rear ebay exhaust manifold this is the 4 time I've experienced a sudden case of crazy bad knock only to find out I have a cracked weld etc. Once the leak is fixed the knock goes away and I can turn the boost back up. This last time I'm pretty sure happened because my drivers side motor mount was bad. One hard launch and it went crazy even on race gas tuned to 10.4 afr and 14lbs of boost it would still get knock, retard timing and run horrible.
So the question is why?
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