Exhaust manifold to turbo studs and turbo outlet studs: Metric class A2-70?, M8x1.25 thread, 304 stainless steel class 70? Exhaust manifold interfering thread nut (self locking): Metric class 8.0?, M8x1.25 thread, zinc hexavalent chromium zinc plated (made before 2007, lot # first digit "7") steel or zinc trivalent chromium plated (made on/after 2007, lot # first digit "7", RoHS compliant) steel Exhaust manifold studs: Metric class 8.0?, M8x1.25 thread, zinc hexavalent chromium zinc plated (made before 2007, lot # first digit "7") steel or zinc trivalent chromium plated (made on/after 2007, lot # first digit "7", RoHS compliant) steel Exhaust manifold bolts with captured lock washer (OEM Mazda Japan): Metric class 8.0, M8x1.25 thread, zinc hexavalent chromium zinc plated (made before 2007, lot # first digit "7") steel or zinc trivalent chromium plated (made on/after 2007, lot # first digit "7", RoHS compliant) steel They suck and they don't work for this application! DO NOT USE the cheap parts store anti-seize or from any normal retail store. I recommend using the proper anti-seize compound to prevent galling or seizure of the fasteners. There are different fastener materials used on the turbo/exhaust manifold assembly. Every one of the cars I installed these particular parts on never came back with exhaust leak problems nor fastener problems. There is no other way to properly tighten these parts without causing future problems. The tightening sequence will take any where from 30 to 60 minutes depending on your skill level/technique/quality of tools you use. The torque specs are for FACTORY FASTENERS ONLY. You will also need a stud installer to properly install the studs. Follow the instructions part of the SST to calculate your correction figures to compensate on your torque wrench. You will need to buy a torque adapter SST to tighten those manifold nuts and bolts properly. Torque sequencing numbers are shown in the PDF. I went ahead and took pics of the turbo assembly and visually laid out the torque specs in them. Since no one has this information or has went through the trouble to get this information, I again took it upon myself to procure and share this information with the community. There is widespread over-torquing of these fasteners and causing them to be damaged in some form as well as improper torque sequencing which has caused exhaust leakage. Mazda never published torque specs for the various fasteners on the MazdaSpeed Protege's turbocharger assembly and therefore I had to reverse engineer this.
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