Hi the only cat that is on the car is a ninja sports cat downpipe it's about 6 months old, also I'm pretty sure I can here the turbo spooling up but will check tomorrow, really hoping it is a hose, when I think of it I was pulling away from the lights pretty slow last week when I heard a loud hissing noise I stopped and checked my tires thinking it was that then put it down to it being a car next to me, but it seemed fine after that, also I could hit motorway speeds no probs it's driving like a 2.0l non turbo is the best way to explain it