On my old gsi I added a inlet manifold and hybrid ko4 peak power went from 301 to 335bhp but at 5600rpm the power was 91bhp more than before.
The car was overall alot faster than before, I had all the talk about hybrids dont work but I tried it and it did.
Later on I went for a gt2876r and bumped power to 404bhp. The car was amwsome when on boost but overall the 335bhp hybrid setup was a faster car as it was always in the powerband with nearly zero lag