Originally Posted by MSV

12.2s stock on the SL55 with Nitrogen filled tires. 295/35/20 w/ 20" Asanti F116-B wheels

Could get it down to mid-11's with pulley, ECU, and headers ...

The SL600 and 65's will do 11's stock, and with a ECU/TCU will do 10's easy. SL600 doesnt have the AMG resale value though, and the SL65 is almost $200k vs $125k for the SL55