Review on Enhance Performance with 10x KraftwerkTURBO 10mm Wrench Size M8x1.25 Copper Exhaust Manifold Nut by Travis Rogers

When I first tried using them to mount the exhaust manifold on my 2004 Audi TT, they hung up as soon as they were ready to go past the end of the bolt. I thought the thread pattern was wrong, but turns out these nuts have three tabs on the rim that help secure the nut once it's properly tightened. I wasn't expecting this, so if you receive them and find they can't be hand tightened past that edge - maybe that's why. Just apply a little more torque to them and they'll keep going down. I believe that going from a 13mm OEM nut to these 10mm nuts will make a big difference in terms of availability. And my existing studs and nuts were rusted to the point that I had to set them on fire to replace them, leaving the exhaust side of the engine looking like a million bucks with new studs and new nuts. Just make sure they are the right size. and you will definitely be satisfied.