The Derv Doctor has done this, I think his car is putting out around 160bhp with intercooler and some other mods. However he is a company based in England! Not sure on the website though but Im sure you will find it if you search on google etc..
you can also try allard and pace as they deliver ic kits, i think the problem with the 306 is that there is very little space between the radiator/fans and bumper but i suppose if you are determined you could spend some dollars and get slimline fans etc etc
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