Re: Manifold to turbo hardware.
the factory most likely uses grade 10.9 metric bolts cause thats the strongest they make for the common bolts. other then that grade 8.8 is fairly strong but not great and i think its 12.5 that is stronger then 10.9 not positive tho, i just know its 12 something. only reason i know any of that is cause i work at a hardware store and get alot of bolts from here for my car.
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