1) THROTTLE BODY UPGRADE .... on the E55 its big bucks but also considerable power to be made!

2) PORT & POLISHED STOCK SUPERCHAGER ... I dont know on Mercedes but i know it makes a big difference on COBRA's

3) CHEAPER CRANK PULLIES

4) EXPLORE THE STACKED PULLIES ROUTE AND SEE IF YOU CAN MAKE IT WORK WITHOUT LEAN CONDITIONS & OTHER PROBLEMS

Have a nice day

Jm