Giving the Mercedes-Benz S-Class a new flare is a carbon fiber-made rear decklid spoiler, which will fit any model from 2014 and up. It can be installed with 3M double-sided automotive tape and no drilling or modifications to the trunk are necessary. Prices for this upgrade are at $1,680.
Last but not least, Renntech has the S550's bi-turbo engine in sight, with an ECU upgrade that will bring the total output up from 449 HP and 516 lb-ft (700 Nm) of torque to 530 HP and 606 lb-ft (822 Nm) respectively. Buying this aftermarket feature will set you back for at least $2,740. Prices don't include tax, shipping and installation.