I am looking to get a 2009 C63 what should I look for? What options are a must have?
I see alot of posts about po30 or po31? Is this the limited slip rear end?

 

You need to go to mbworld and ask there, wealth of knowledge on that site.

 

Limited slip is must IMHO. It will only control about 40% of the slip however as these cars have so much power. Those w/o limited slip tend to sizzle their tires. The P30 package is great. It includes the limited slip and heavier suspension. I have it on my car. However, be aware that the ride can be "bone jarring" on bumpy or non smooth roads. I think P30 was phased out sometime in late 2010. My car is an early 2010. I will let others here correct me if I'm wrong. SERVICE records are a must. The rear diff had a break-in oil in it that should have been replaced in 1500 miles. Mine was not but they said all was ok at the dealer...so I assume its ok.

 

Don't they have an aftermarket LSD available that offers greater lockup?

 

Yes you can buy a 100% limited slip diff. I'm thinking about getting one. It is however about $2800 installed.

 

not if you purchase through us, the LSD is $950, install kit is $300 (fluid, seals, bearings, sealant) and install should not be above $5-600.

Let me know if I can help.

James@ACG