Rob
I take your point. But I think that there are all sorts of complications here. If, for example, one was unfortunate enough to have a piston break up or a valve drop, then Fiat could very well say that they would not repair the engine under warranty as non-standard parts had been fitted which increased the power output beyond its design limits. And if a special camshaft itself broke, then I think claiming from a manufacturer in Italy for consequential loss could be pretty tricky and I, for one, would not expect much chance of success.
When I was selling parts for Ducati motorcycles, including various special cams, carbs, exhausts etc, we always specifically disclaimed any liability whatsoever for consequential loss, as we had no control over the conditions of use, condition of the rest of the engine, or skill level of the customer who fitted them. If it broke in normal service within 12 months we would replace the part, no more than that.
John (ex-John Smith Ducati, in another life many years ago)
point taken and well made but there are companies that will warrant engine tuning as part of a tuning package. you pay your money and take the level of risk you are comfortable with.
for example, say an Abarth kit cost £2k fitted and I can do my own for £1k I would be prepared to risk it