A mechanic suggested me installing a system (a conduit connecting some point and the fuel duct.... dont know how to mention.... it increases the sensitivity by introducing some steam into the fuel.... something like that)

After installing it, the response of the engine will be much faster.

The price is HKD2500 (USD320)

My questions are

1.) do u know what it is? i mean the correct term in English?
2.) any harm to the engine (he said no of course)
3.) increasing power and torque? (he said yes of course)
4.) reducing fuel? (he said yes of course)

Thanks!

Water vapor injection works and can decrease combustion temperatures and octane requirement as well as increasing power. A well-designed and integrated system can pretty much do as they claim. But, you have no way of assessing what will happen until you drive it, and if it is poorly adjusted or designed, it WILL damage your engine. At the least, you could get hydrostatic lock, which would be catastrophic.

I would find testimonials from the exact kit installation on another similar car before risking your investment.

Steve

Yes, theoretically it'll increase power output of the engine and do all these wonderful things. But there MUST be a serious downside to this concept, since none of the auto manufacturers have yet to come up with one for production, nor is it widely popular among the hot rod enthusiasts.

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95 E320 Cabriolet, 159K

Thanks!! How about Fuel Vapourisation Kit?
Is there any for CLK320?
I read http://www.lawbright.com/energy/vapor.htm
and it seems this is more useful than Water Vapour Injection.