Felpro gaskets have been proven past 500whp. The reason ka's blow head gaskets under high boost is either due to detonation, or lifting the head because of toothpick thin m10 head bolts. Hardened arp studs provide a much higher clamp load. It's arguable that a graphite composite head gasket is actually better than a MLS gasket on these motors at 300-400whp especially with stock internals. If you experience detonation or overheat, what would you rather change? A burnt/blown headgasket, a piston with broken ringlands, or a bent connecting rod. I'd take a headgasket any day. A MLS headgasket is less likely to blow due to detonation or lifting the head on these engines putting the brunt of the force on the rotating assembly. Think of it as a fail safe.