hey guys want to report my great experence with speedtuningusa. They are great sent ecu out on monday and got it back on wend. The car pulls like a beast now its a tad faster off the line 0-40 than my e320, but after that it pulls super hard leaving the e320 in the dust im very pleased with the result after 70 it is as fast as my clk500 the speedo will just zoom across. I would highly recommend speedtuningusa to anyone looking to gain some performance out of there car