Dinan Engineering decided that a 550i can do much more than BMW believes and came up with a tuning kit for it. A standard 550i is powered by a 4.4-liter, V-8 engine equipped with TwinPower technology for a maximum output of 400 horsepower and 450 pound-feet of torque, which are pretty respectable numbers.
The guys over Dinan decided that wasn’t enough and installed larger intercoolers and turbochargers, and remapped the ECU. Also included with the kit is a new exhaust system and a carbon-fiber high-flow intake. All of these upgrades take the final output up to a total of 542 horsepower and 587 pound-feet of torque, which is only 18 horsepower less than the M5 and 86 pound-feet of torque more than the M5. Top speed has also been increased to an amazing 200 mph, which bests the M5’s top rating of 190 mph.
The problem is the price, as a base 550i costs $62,700 and the kit adds another $39,000. This means a total of $101,700. you can snag up an M5 sedan is from $90,200.
Click past the jump to read more about BMW 550i S3 by Dinan Engineering.
BMW 550i S3 by Dinan Engineering in Detail
Like any other tuning kit that adds a massive output, the 550i S3 also received a series of technological upgrades. The tuner started by adding a new set of 20-inch performance wheels wrapped in Michelin Pilot Super Sport tires sized 275/35ZR20 up front and 295/35ZR20 in the rear. These wheels were installed to reduce unsprung weight.
Next, Dinan installed a new suspension system that includes new front camber arms and low-compliance rear control arms. With the new suspension system, the 550i will deliver reduced understeer and will also ride 0.5 inches lower than the standard car.