"It produced over 400 whp on a 1.8 liter 4 cylinder"
from the post about the lancia delta..

this is my engine.. a 1.8 liter twin cam lampredi designed engine.. I would give my left nut for that supercharger. they were small and worked freeking great. that car killed in the rally's for years. it sounded cool as hell. if you go to turbo124.com he has pics of a scrap engine from one of these cars. its iteresting to see how they did it. these were built custom by abarth.