I seen a few youtube where ISF beats slk55, so i always wanted to race one to see. well while i was having dinner w/ my gf yesterday night my friend called me up and said lets race, he wanted to test out his ISF. he dyno at 380rwhp. i was like sure. so we did a few high racing first. we did a few 40mph roll and 50mph roll. Amg won. we would take it up to about 130-145mph. there was like 2 times he did get the jump on me but wouldnt be able to pull away. we then got off the highway and found a good long street. from dead stop AMG all the way. i would have to say its all cause of my LSD or i dont think it would be an easy win. His ISF is fast though. bottom line i dont see ISF taking slk55 downs well atleast not mine. i dont have any videos of the race but i do have pictures that he took of the 2 cars while we took a break in a parking lot.