i used to have an IS with i/h/e, and afc. The car was ****ing slow as ****. I believe the story, but i also believe that if it was turbo, it was either not tuned, running really low boost, or in the hands of a crappy driver. By the way, all the IS guys think their top end is so great...Believe me, it isnt. It's a real sissy straight 6. With a turbo, however, it can rival supra's.