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P-Tronic tuning box, is it good or bad?? I wish to put a best quality chip or tuning box on my merc, please help me? What is the best and the safest for engaine???

Is it good P-Tronic box for my mercedes?? My merc is past 81 000 km so far! I wish to put the best i safer tuning chip or box in my merc! i am new, so please help me, what is the best whey to increase horse power and torque?