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P0174 has the same possible causes as P0171, it is however indicating that bank 2 (driver side) O² sensor is reporting lean.

As it is just one bank reporting this look for possible causes that would only affect one bank--this pretty much rules out MAF issues and intake leaks before the TB; leaving exhaust leaks. Leaks upstream of the O² sensor and close by downstream (up to 12" or so) will cause the O² sensor to report the mix is lean when it really isn't...
 

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Well I havnt replaced any O2 sensors but I do have a custom tune by Bama to compensate for my O/R pipe and 70mm throttle body and plenum
That has nothing to do with the front O² sensors, the ones used by the PCM to control the engine in closed-loop mode.

Also there is nothing that needs to be changed in the tune for an aftermarket TB and plenum--the MAF continues to monitor the mass of the air entering then engine, and the PCM adjusts things accordingly. The same tune changes that fix the stock tune's "suckiness" work just fine with any intake mod you might install..
 
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