I was on my way home today and thought I could smell coolant - thought I was being paranoid. Got home and checked the expansion cap and it was dry! I had to put over 2 litres in it to top it up. I then discovered that both sides of the interior carpet either side of the gearbox are soaking wet with coolant. I'm thinking a burst heat exchanger? What do you think? are they cosworth specific or will any sapphire one do?