peugeot 307 hdi, fumes entering inside cab?

just bought this car and never noticed until driving distances that my eyes started nipping and running, it seems fumes from engine compartment are getting in, exhaust seems ok as i cant find any blowing but there seems to be a slight blow near the turbo, but cant pinpoint exactly where its coming from, i dont want to take turbo of if i can help it and i dont want to put exhaust paste round flanges unless someone else has had similar problem and found a cure,
thanx
graeme