So I had a new Scorpion Exhaust fitted today on my Cupra 300. I had a res delete before which wasn’t fitted the best so blew a little. I now have this fitted and it sounds amazing. Only thing I have to say is it makes a slight hissing sound when I put my foot down? The same as when I had the res delete. Does anyone know if this could be blowing or something else in the car?
