Difference in tires of SL65 and CL65?

I'm going to the UK to do my Masters and PhD but I'm sponsored by a local university and to get the E55, I'm going to work as well - lucky I have a well-paying occupation although very unappreciated in Malaysia.
If only I could move to Brunei heheheheh
Everybody can tell anybody their opinions, but in the end its the owner of the car that gets to choose what he/she wants right?
If somebodywants to put 24 inch, cubic zirconia encrusted chrome wheels on their SL, then let them...
Its just seems rather odd that CL65 does not come with an LSD. I really don't think AMG engineers don't put in that thing purely because of road noise/harsher rides? And most definately I will not believe/tolerate them not putting in an LSD on a $185,000 car to save some cost. They did not even mention having an option of LSD on their cars. So I am sure it has to do with engineering issues thats rather quite serious. Benefits of LSD are huge and not putting one on, must have some ill effects that they know and we don't.
The Best of Mercedes & AMG



