The CLS 63 AMG is an impressive car straight from the factory.  Luxury, comfort, and power inside a beautifully designed body.  Here at GMP Performance we like to push perfection.  Diving right into this project, we turned to RENNtech's ECU Upgrade for the biggest performance gains available on the market.  It took the car from 556 HP / 550 lb-ft torque, to an astonishing 669 HP / 734 lb-ft at the crank.  Tackling the 0-60 mph in a mere 3.2 seconds; and the quarter mile in 10.9 seconds.  KW Suspension was added to keep the power to the ground.  To keep things in the family a set of RENNtech downpipes were ordered for more HP gains as well as a menacing growl.  To pass NC emissions we fabricated high flow cats into the downpipes.  We went to ADV1 Wheels for a set of ADV05.1 one-piece, forged, mid profile, 20 inch wheels.  With 245x30x20 Michelin Pilot Super Sport tires in the front and 295x25x20 in the back.  To finish everything off, badges, grill pieces, emblems, wheels, and many more parts were sent off to be painted and color matched satin black, and a monster was born.

On these downpipes everything seemed to be just fine untill they were both installed together. On the first set that came in the drivers side pipe was to long and caused the rest of the exhaust to push rearward around an inch to an inch and a half. The pipe was sent back to be modified to the proper length and fitment. After the pipe was returned it was tried again and it was found that there was now an issue with the ball seat connection and it was now to large and the pipes would not seal. The pipes were then removed, sent back to the manufactor and the stock pipes were reinstalled until a different set of downpipes were found.