are the performance chips like racechip real and does it really work. they increase the power torque and they lessen the fuel usage of the car. But thinking it like this, why wont the company that makes the car buy the chips so they can get less fuel consumption, more power and more torque. and all newer cars have more power and less consumption so they could simply install a chip and thats it.

 

Have a look at no. 3 in the link.

Tuning FAQ

 

You'd imagine each dealer can make a custom adjustment for you depending on your area then.

 

There's some RaceChip data at:
https://mbworld.org/forums/c450-c43-...er-anyone.html