Just curious as to how long should I go with a lean bank 1 code. I just install FI test pipes and I know that is the cause and I'll need to have the A/F ratio tuned. But it will take a few weeks to save up the cash.... Or do the non-fouls sensor correct the problem or do they just trick the ecu so the ses light goes off.

 

Non-foulers will cause the code to go away. Straight pipes won't mess with the AFR enough to "require" a tune, but it is highly recommended for best performance.