Focus st225 mk2 300bhp

Hi I have oil dripping down the bumperer next to drivers head light, there is oil on underside of the boneyjust above headlight, oil seems to be coming out the intercooler pipe joint next the the head light, the turbo only boosts to just before the red on the guage, it used to boost to end of red. Is this the turbo seals. I don't have oil at the dump valve and the MAF is dry, no smoke out the back either.