Hey guys,
I'm looking for a new gasket between the block and my turblown manifold.

Has anyone used Mambatek before?

https://www.mambatek.com/en/products/sus301-93-mazda-rx-7-fd3s-n3a1-13-461-exhaust-manifold-to-engine-gasket

OEM Fd single gaskets is really expensive, I've read that people use FC gaskets with a cut through the middle to act as a stress relieve point.

 

not sure where that description came from but they say the factory gasket is graphite and weak.... which it is not. the one in the picture looks pretty good and like it would hold up pretty well.

yes, factory parts are expensive but keep in mind that it took 30 YEARS for them to fail in some cases. the FD in an expensive car to maintain. it costs what it costs so trying to cut costs on things like gaskets is typically a way to ensure you're doing something twice. those gaskets looks good in the pictures but how they will perform or how long they will last is to be determined.