Re: 3" DP Pics?
wideband should be 24" from turbo max.
Your pretty limited on design, your turbo location is set, and you have to go between the frame and bellhousing. Watch that you dont come too close to the plug wire boots. Also, plug wire #6 is a straight boot (what most people run) so make sure the downpipe clears the straight boot and wire. Bring it down between #4 and #6 cylinders. Like show above. Its easier to do work with a 2 piece dp. I made mine 1 piece, and it takes some wiggling to get it out. If you are running A/C, you are really limited.
Also, you have to worry about wastegate location, servicing the wastegate, etc.
Good luck.