Nitrous is no more stressful to an engine than turbocharging or supercharging so your statement is invalid.

And I'm not even sure why you are mentioning nitrous and meth/h2o injection in the same context? Ones a power adder, ones a charge cooler....maybe do a little more study on google, the answers are not that hard to find.

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[B][COLOR=red]Jerk of the circle.[/COLOR][/B]