as you can see these headers for a non s/c frontier has bungs for the o2 sensor.
as you can see there are probably ways in which you can modify that 3.0 design and mimic this one. IMO, your best bet is to find someone with CAD knowledge and have him mock up headers based on stock spec this way you wont have clearance issues and what not.
GOODLUCK!!

as you can see there are probably ways in which you can modify that 3.0 design and mimic this one. IMO, your best bet is to find someone with CAD knowledge and have him mock up headers based on stock spec this way you wont have clearance issues and what not.
GOODLUCK!!