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Many performance applications use no gaskets. However you literally have to have a perfect surface on BOTH surfaces. (Do you want to take your head off to get machined?)
I think quality OEM nissan gaskets and CLEAN surfaces area big starts. Followed by hardware which gets tricky. Personally i like to try and keep up on the torque of the manifold nuts, no its not fun... but it ensures they arent backing off.
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