Later z34s, I'd say '13 up, are less forgiving of test pipes when it comes to a SES. My '14 has test pipes, z1 intakes, and full exhaust. After data logging I've found no reason to believe it's going lean. Unfortunately without a tune you will most likely have to cope with the light shining in your eyes. In reality it should do no harm. That being said you'll not regret the money spent on a tune.
Sent from another dimension.
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