V12 Anti-Lag Speedriven
 

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Speedriven's Standalone Anti-lag feature is nuts on stock turbos! High-performance standalone for the Mercedes V12 engine management. Listen to that anti-lag, the sounds of thunder. Switch between fuel types and tune settings, rolling anti-lag, and advanced fuel management. Visit us online learn about all of our performance parts and services.

I don't understand what does this do? Just make popping sounds on deceleration or some thing else ?

The anti-lag system (ALS) is used on turbocharged engines to minimize turbo lag on performance vehicles. It works by arranging for fuel and air to be in the exhaust duct after the engine, and before the turbocharger. This ignites in the hot ducting and the combustion process that occurs there keeps the turbocharger spinning when the engine is not delivering enough exhaust gas. (Wiki)

Hope this helps!