Originally Posted by Boosted Performance

That is done all wrong. Twin 50mm turbos with those small T3 housings on a large displacement engine are a waste of time. He would have made much more HP with the 62's in a T4 configuration. You can see how he runs out of breath on the last dyno (video) because the small T3's can flow enough.

On top of that, if you are going to twin charge you don't use a centrifugal supercharger. The correct way to do it is to use a roots type supercharger, as it will give you boost instantly (at 1000rpm).

Somebody there forgot to do some research before spending a decent amount of money.