[AnotherUnixGeek]

None of these things materially improves the performance — or even the economy — of the vehicle in a way that’s meaningful to the owner.

They will, however, add to the maintenance cost and reduce the robustness of the cars. The turbos in particular make me nervous - one more expensive component to use oil and break down. I got a new car with a 6 cylinder turbo-charged engine last year - it's the first car I've ever leased, and the maintenance headaches to come are one big reason why.

[PAR35]

>>>The turbos in particular make me nervous<<<

It’s not the turbos themselves that worry me - they are likely to last a fair amount of time. It’s the heat buildup in the engine from the turbos that are going to cause the expense.