for £500 id cheet and get some gas. couple of mates run wizzards of nitrous kits, ones on a 106 rallye, thats had 25hp on it for ages no prob and another has 75hp in a 205 mi16, been running it for over 2 years again with no problems. iv spoken to won about a kit for my car, guy that i spoke to had a 16v with 50hp in it i think.