Hi there and a warm welcome to TorqueCars, good to have you along. What's the tuning scene like in Houston? What power figure are you aiming at? You'll have to post up some pics for us when you get to 10 posts.
First, let me thank you for your reply. Houston is a car lovers Mecca. The good weather and lack of snow keeps the cars in very good shape over the years. Salt is not an issue. The population density makes it the third or fourth largest city in the States and a central air and shipping port. Everything passes through Houston. We have something for everyone. Musclecars from the 60's and 70's, imports, drag racing (one of the fastest tracks in the world due to near sea level elevation), indy car events, circle track, monster trucks, SEMA, etc. Truly is a great place to live and drive.
The E550 starts out pretty healthy, as is. 5.5 liter putting out 382HP and 390ft/lb of torque. This gives it a 4.8 second run from 0-60 mph and a 13.4 second dash to 108mph at the end of the quarter mile.
I am shooting for 525HP and 500ft/lbs of torque, 4 second 0-60mph and a 12 second quarter mile. I am told a limited slip differential, a supercharger, and an ecu upgrade will get me there. I am trying to avoid exhaust work that would make the car too loud or not comply with emission regulations. I still want to keep the luxury aspect of this four door sedan.
Kleeman and Renntech seem to be the common choices but there has to be other LSD solutions for my car that are more cost effective. Same with ECU upgrades. I also want to avoid having to pay someone to change my ECU back every time I take it in for service. I may have to get friendly with a good mechanic to make it happen.
Any suggestions from the group are welcome and thanks again for your response and interest.