sprint boosters

I had a post on the forum but it seems to have disappeared, so here goes again. I have made some progress towards buying a SB, but am getting some confusing advice on the correct product to buy. They range from a W204 don't know anything more, a SBDD 451A probably out of date, to a newish...

C220 CDI Sports AMG Has anyone fitted a Sprint Booster to aid acceleration to their Mercedes?. My car is only a year old, and has been rechecked by Mercedes, they say it is all set correctly, but still on take off it occassionally will not go, it hesitates for half a second (seems like 1 - 2...