This is from a UK tuning company, for my '05 CLS500 I'm sure a US company will give you a similar story;
Dear Colin,
Thank you for your enquiry regarding the upgrades Angel Tuning offer for your Mercedes CLS-Class.
AT A GLANCE QUOTE
Charge including VAT & Coming To You:-
£250.00
BHP Increase:-
20
Lb Ft Increase:-
22
ITG Competition Air Filter (Optional):-
£80.00
Economy Improvement:-
8-10% Overall / 14-16% Urban
FULL QUOTE
Engine Tuning
We offer engine remapping, the modern version of chipping which is the correct way to safely tune a modern petrol engine. With our ECU remapping you get smooth and progressive power, with improved response, that can be tailored to your requirements. Angel Tuning are able to offer tuning services at your location with our mobile tech team, who are fully equipped with the latest diagnostic equipment as well as a wide range of tuning hardware. Whilst we normally book 1-2 weeks in advance for mobile it depends when you book in as we can often get customers in earlier.
Our charge for the 5.0i is £250.00 including VAT. This price includes the engine tuning work to add up to 20bhp, (22lb ft torque) pre and post testing, acceleration testing and travel to your home or workplace.
Whilst we are unable to give an accurate figure on the improvement in economy after your car has been tuned, most people get between 1-3mpg improvement on petrol vehicles providing your driving style and the speed you drive at does not change! As the engine is running more efficiently, the emissions are actually improved so there will be no problem at MOT time should you have the car at that point.
We would like to state that we are not the sort of company that tries to get the ultimate extra 1bhp at the expense of drivability just to look good on paper nor do we quote the power figures from a single dyno run set up to achieve a short term burst of power to win your business. We know from vast experience what these cars can take long term and our aim is to achieve the best combination of power, longevity, economy and as mentioned, drivability.
ECU remapping is fully reversible, which means if you are unhappy with the results on the day, we will return the car to normal and thank you for trying us. After this, we offer a 14 day "cooling off" period** during which you can at least get the chance to test our work over distance and familiar journeys. If once again you are unhappy for any reason, we can either modify what we have done or indeed return the car to standard and give you a full refund. When you come to sell the vehicle we can return the car to standard for you free of charge****.
Other Upgrades from Angel Tuning
Angel Tuning can also supply an ITG sports air filter, which uses a patented tri foam filtration element as used in their competition induction systems. This will increase the power by a further 1 – 1.5% due to the improved air flow rate and further improve the throttle response. The additional price on this is £80.00.
Company Information
Our technicians are full insured not only to carry out the work on your vehicle but to fully test drive a modified car too, which is something we implore you to check if you decide to go elsewhere for a “cheap deal”.
Angel Tuning are a UK wide company with locations strategically placed to ensure coverage. We are big enough to cope with the largest of demands but still retain the small company approach to care and flexibility. By becoming an Angel Tuning client, you benefit from the experience of a company tuning in excess of 200 vehicles per month and a commitment to customer support and satisfaction. We are an independent tuning company, we are not dictated to by being a franchise of another tuning company and can therefore be flexible to every individual’s needs, be it from a dealership to a private individual.