2006 SLK55 AMG where I have tuned the ECU with 2 upgrades and unlocked the 7G transmission activating the (A)gility mode and installed the 9-Drive throttle response controller where these three mods have greatly increased the performance of the car.
I've replaced the faded C-Pillars covers with OEM, added new MB red wheel center caps, multifunctional GPS heads up display HUD with 7 different screens including speed and brake test and live data feed via the OBDll. Also, replaced blown passenger HK speaker group with brand new OEM from Mercedes for only $238.