BLM at 142 should I be worried?

[we4Mateo]

Something weird happened. Swapped out the old exhaust for an ATR single shot mandrel bent. BLM went to 128 at idle! I did added a clamp where the downpipe/standpipe connect. Could an exhaust leak after the turbo cause the higher numbers?

The leak just has to be before the O2 sensor, so if in stock location, no, but if you have it in your DP then yes.

 

[Major Nutz]

The wideband O2 is in the downpipe about 15" down. The other is in the stock location.

 

[we4Mateo]

Since you are running an SD chip, I assume it runs off the WB so yes, that would cause an issue.