Originally Posted by koke'sfocus
The stock flex pipe is welded to the stock manifold. So unless you wanna cut it off and try to make it work then.>>>> I suggest just buying their flex pipe. I know it's expensive but it's worth it. I think it will save you some headaches later on when you go to install it. <<<<
Just to clarify the 08+ the manifold is NOT welded to the mani cat
Just to add the fwerk's flex is bigger & designed for their header.