$449.
Used stock ECM control unit. Fully functional. Should fit S550, S550 4-matic. S63 AMG. 4.6 & 5.5L. Sedan, 4.6 & 5.5L. Coupe, 4.6L & 5.5L. - But check your part number. WILL NEED TO BE PROGRAMMED TO YOUR VIN NUMBER BY A DEALER OR QUALIFIED TECH.
No returns.
Paypal only. What you see is what you get. About $1000 new.