The 3 bolts that attached the rear exhaust manifold to the exhaust box, made a successful bid for freedom (clearly I hadn't tightened them up enough). Even so, the manifold and box didn't separate and the exhaust doughnut stayed in place. However, the air getting into the system caused the most spectacular cracking from the exhaust when I lifted off the gas, typically as the revs dropped below 3,000 rpm. Occasional loud bangs randomly occurred, I have no doubt that flames accompanied the bangs. I absolutely loved it. I couldn't wait to take the car out. The throttle response was epic, it was a real on/off switch. If I needed the exhaust to be quiet (i.e. passing horses or some poor sods pushing a pram trying to get their child off to sleep), it was necessary to keep the throttle slightly open. But I could then give it some welly, snap my foot off the throttle and it was like being back at Brands Hatch with the A1GP cars! Seriously, the best sounding cars ever, in my opinion: hear what I mean 30 seconds into this clip: And here comes the BUT... Round my way (Essex, UK) there are loads of young men, in pumped up Ford Focus cars, decked out like rally cars, with ridiculous (and expensive) exhaust system doing exactly what I have been doing. And every time I see one I think 'you attention seeking knob'. But quietly I am envious... I am probably 30 years older than these lads. It's very juvenile. Anyway, I have replaced the bolts and the exhaust is now back to normal. It makes the odd dull thud on down shifts and probably sounds like a Ferrari should. But it really isn't much fun. I am thinking of buying another pair of doughnuts and seeing if I can rig up some sort of adjustable breather. This would allow me to regulate the amount of air that leaks into the system - and thereby the amount of noise it makes. Opinions and views appreciated, it is all part of my therapy.