Imagine the manifold not being ported last weekend. That means that there are only three holes for all the air to go through. This may now even be building correct PSI or even getting air to all the cylinders. For low RPMs this is fine. But for sure the M90 issue happened because of a last of flow. Even with the current opening of the manifold. I still can’t sell a product so horribly underdeveloped! This manifold and adaptor plate need further porting and development!