I've a bbt418 hybrid + Chinafold manifold to fit but have heard of the gasket between the turbo hotside & manifold blowing, I'm trying to avoid this as don't want to be taking the turbo off again. What causes this? Is it from the heat or poor mating surfaces? I've read there's a few options. Can run gasketless but what's envolved to do this, is it having both the faces of turbo hotside & manifold skimmed flat by a machine shop? Standard gasket with nordlock washers or even a copper gasket? Who's been here & done this & has a definitive answer to what works best?