I own a C43/1999 and i wonder if its possible to increase the engine power somehow(ECU,airflow....)
I find this company, Kleemann...bun i'm unable to find the price and where to buy something if available
So, please, some help!

I've only seen supercharged setups when it comes to getting more power on those engines. I must say though the Kleeman supercharger setup did not impress me at all. The last one through the shop was a real hack job that was eating fuel pumps and rear SAMs for lunch. So without actually giving you a good answer on how to get power I'm gonna rather tell you to be VERY careful in making your decisions on who and how the car is modified. As with anything you get what you pay for and a cheap promise of power is likely to cost you a fortune in the long run and leave you with a car you are not happy with.

It looks like Kleemann it's a serious company(Germany)and I think they know what they doing. I call local mercedes dealer and THEY install the kit(compressor, cooler, injectors...)
If this is not a good company, my question is still on: if is posible to increse the HP and who make the best parts?

Just b/c someone will sell you a kit doesn't mean it's worth the money. The kleemann supercharger setup I last worked on was a mess. Their approach is half assed at best. They install a voltage stepper inline to the fuel pump that ups the voltage to 17 volts when it senses more than 3 psi. Supposedly it raises the fuel pressure to over 100 psi. It doesn't actually measure the new larger amount of airflow through the charger and meter fuel for it. It just overdrives the f##%$! out of the pump (which will cause it to fail) and hopes everything stays rich enough to keep from blowing up. If you think about it the fuel pressure should be controlled by the FPR. The kleemann setup has to overdrive the pump to the point that the FPR cant release enough fuel and pressure climbs above the normal running pressure. If it were my engine I would want a LOT better control of enrichment. A well designed kit will will include software that is capable of measuring the increase in airflow and provide a metered amount of fuel for it.

Whoa there guy, I think you should get the facts down before blasting the product. Kleemann systems use 2 kinds of fuel boosting. There is a secondary regulator mounted in the return side to maintain pressure under
light and medium throttle. The "boost-a-pump" box is to secure maximum fuel delivery and volume under full and wot conditions. All fuel mixture is still controlled by the ME ecu and readings from the air mass sensor which all Kleemann systems maintain. (The AMG's are speed density or no air mass.)
Injection duration controls the mixture and is kept in check by the Air mass,
o2 sensors, and knock sensors. It is just as accurate as it was when it rolled off the line. Just more air and fuel.
I have installed countless Kleemann systems and have yet to have a single issue with any of their products. I have never seen damage done to MB product from Kleemann product either. Including fuel pumps.
I was driving a 05' C55 today that I installed a Kleeman Kompressor, Headers,
SLR Cams, Exhaust, ect on over 10,000 mi ago. This thing is the fastest car I have ever driven with over 600+ hp on tap, yet it runs smooth as a jet and gets 24 mpg on the hwy. I have yet to have one single problem with this car. Except for restraining my right foot!
Not bad for a 200mph commuter.
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

Well maybe I should let you talk to the custsomer who owned the car I'm referring to. It was in my shop to get it's second new oem fuel pump in the three months since he had the supercharger installed.(elsewhere) That's right, the original pump failed, the new oem pump also failed, both within three months.
You insist that they leave the factory controls in tact which I found no evidence that they didn't. However when at WOT the management goes into open loop. No O2 sensors making sure the mixture is correct in open loop. It just takes reading from the air mass and delivers it's previously mapped amount of fuel.(which was mapped at the original fuel pressure) Feel free to explain to me how the original electronic controls knows how much duration the injectors should have when the fuel pressure is now more than the programming is mapped for without the feedback of the O2 sensors. It's a crap shoot in the dark that does nothing but err on the side of way too rich.

You may have a car that that can accurately meter fuel for roughly twice the horsepower while having two different fuel pressures using the stock management and hardware. However there is no way ever you would sell me that idea to be installed on my very expensive mercedes engine.

You are spending a lot of energy on a product you likely have little experience with. Your client should return to the shop that installed the system concering the fuel pump failures. It sounds like there is a parts or installation defect. The systems do have full warranty coverage via Kleemann USA.

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?