The intakes shouldn't be throwing any codes. 1168 is an O2 sensor code, which you mentioned you had problems with...
As for the Stillen exhaust, my problems with it were unending really, but they made design changes after that first batch, and most people are reporting no install problems anymore using the complete Stillen CBE (including their Y-pipe).
Also, I wouldn't recommend using washers to space off that crossmember, that's got to affect the rigidity.
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