Although the other guys boast about details on why their manifolds are better than others, they are missing the boat on simple details. As you can see in the picture below,
both manifolds were left outside for 2 days. The other guys did not coat their manifolds. Max Performance coats each manifold with a name brand high temp engine paint to preserve the "new-look".
Also, we port match our manifolds to a hi-performance fiber/metal composite gasket that will seal the heads to these manifolds without any issues.
They brag about the casting being too bulky, but if you look closely the other guys do not have enough metal around the bolt holes to evenly distribute the pressure of the head of the bolt to seal the port flange. Max Performance had a greater amount of metal to evenly distribute the pressure ensuring a good gasket seal. Also, at first glance you'd say, the 'other' manifolds at least flow better. NOT TRUE. In dyno tests conducted by HPP, both brands exhibited an 8hp gain.
They also brag about their manifolds being approx 2.8 lbs lighter. Their walls of the manifold are thinner, so there is a greater chance of cracking due to the heat cycles. If you physically feel the inside wall of the their manifold, you will feel the thinness of the walls. Ours are overall thicker. Also, at first glance you'd say, the 'other' manifolds at least flow better. NOT TRUE. In dyno tests conducted by HPP, both brands exhibited an 8hp gain. The larger ports can't be utilized because the gaskets are smaller than the ports. If you modify the gaskets, you risk blowing a gasket out. If you don't modify the gaskets, the exhaust flow hits the gaskets causing turbulence.
One major detail that the other guys missed was the outlet of the manifold. By looking at the picture below,
Max Performance has a larger, cleaner surface for the down pipe to seal. Being these are true 2-1/2" outlets (not 2-1/4" bored out to 2-1/2") , you can see the difference is the angle cut.
Our gaskets are not only very high-quality, they're also included!