8mm/10mm Hex Intake/Exhaust Hardened Steel Nuts, Pack of 8

These are seriously the World's Best nuts for your VW exhaust system, and equally as good for hard-to-reach intake manifolds.  They feature 8mm threads and are tightened with a 10mm wrench or socket.  You will literally bend your 10mm wrench before you round these nuts out! The flange on the bottom side provides a large footprint that really locks these into place so they don't spin off.