09-04-19, 10:31 AM
I think the "restriction" is in the 2005 headers. If I remember correctly Mike (Falcon) said there's a series of small diameter tubes in the end section of the headers where the silencer would slip on. I think the effort to remove them was more trouble than the value of any potential gain. Maybe that's why the numbers are different.
Whizz kid sitting pretty on his two wheeled stallion.