If it's a quote, I don't see why you couldn't quote it without using the stars. The PIP is different to the English Ext 2 project in that it's research based (unless the Eng Ext 2 candidate was doing one of those case study things). So it's not like a story where you can just add in a few profanities here and there. Don't include them unless absolutely necessary, I'd say.
However, if they were necessary, personally I would put the stars in, because I could see how a PIP marker may judge your work based on this, which would be unfair.