Originally Posted by batto

Hey Stefan I run the XXX with the 2611, How ever the newest Sirio V K comes with a 2653 or 2652 I cant remember the # and it also has a conical manifold. Will be trying it at club racing this w/end. I ran the motor with the 2611 and run time and power was fine but am told I should notice a difference with the pipe and manifold that came with it. The new one has a slightly forward angled stinger and is a bit shorter on the stinger as well. Will post again after Sunday's club racing.
Noel