How an EGR Valve Works

Introduction
An EGR (exhaust gas re-circulation) valve is designed to lower NOX (NO2) gases that occur in the combustion chamber when temperatures reach over 3,500 degrees Fahrenheit. NOX gases have been proven to cause brain damage in humans, therefore EGR valves have been mandatory on most vehicles since 1976. An EGR valve controls exhaust gases and allows them to enter the intake manifold and flow into the combustion chamber at certain times in the operation of the vehicle to reduce combustion chamber temperatures.

Electrically Operated EGR Valve (Linear)

 

Vacuum Operated EGR Valve

To test your vacuum operated EGR valve remove the vacuum line that is connected to the valve, apply vacuum using a vacuum pump to the valve while the engine is running. If the engine stalls the EGR system is working, if not, the EGR valve may have failed or the passages may be plugged with carbon deposits. Testing of a Linear (electric) EGR valve requires a scan tool capable of applying the valve on command.

Source by:
http://www.2carpros.com/how_does_it_work/how_an_egr_valve_works.htm

Audi R8

I really like the preview of it and check out the video below.
Audi R8 LMS

After having a look at the review by Top Gear, it really gain my knowledge about the magnificent Audi R8. This car is build with a combination of carbon fibre, magnesium, and aluminium and has the engine in the middle. Although the car do look small but it is as spacious as you wish for and you would not manage to hear the noisy sound even though you're running on 100mph and it's a V8 engine which eveyone would thought of hearing some screaming sound out of it like what ferrari does.

This car impressed me when it runs a 0-60mph @ a 4.6 seconds.
Audi R8 Review By TopGear

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This is what I called Vip style. This video is specially dedicated to all the Lexus lovers where they can do this to their ride by adding air runner kit to adjust the height whenever you want and check out how low can it gets.