if you want ultimate power with NO lag at all, you need to build a nasty littel fuel munching creature called a boost engine. there are diffrent ways of building them it can be done with 2 turbochargers but getting the right inpellers is a b!tch.
basicly you build a jet engine that's sole pourpose in life is to blow as hard as it can into a very large turbocharger. the jet can be fasioned out of a larger turbocharger, if the turbo thats blowing boost in the engines direction has some boost fed into the jet that feeding it's exhaust stage this it to prevent the turbo stalling and it how the boost to the engine is regulated.
the optinal way to do it is to basicly build a turbofan jet engine but the fan in a compressor inpeller desinged for pressure more than flow, this way is much much much mre efficent a lot quiter but still dose get quite hot it is also much more reliable
the advantage of this system is you can have 40+ psi of boost from idel to the red line if you want with NO lag at all, it's actualy more responsive than a supercharger as the whole system is fully pressuriesd all the way to the throttel butterfly all the time. you tune like you would a supercharger enigne but there is no parastic load on the cranck from the supercharger as it's produceing it's own power
the downsides are. they are LOUD, they get very very HOT and f**king hell they guzzel some fuel a bit quick
