Stock exhaust manifold has cat mounted into it, so unless you cut it off and weld a flange it will not work. And I'm not sure if you can even do it properly, because it's very thick and just wouldnt be right

 

Okay OP, I see what you're saying. You would have to weld on some sort of flange just to mount the turbo, so in that sense it sounds like it could work. As for the flow as stuff, it would be no better that the log style other than maybe the ports being larger, or the diameter of the piping would be larger.

 

I mean it could work i guess, you can make anything work if you have money or right tools, but it think it will be easier to go with Tim's log style manifold.