As always Alex,
brilliant information from you backed up with data.
Got there DRF's. The ignition timing didn't hit target with the X pipe installed. A few more runs and you would have hit them and the real gain would have been a little higher.
None the less, brilliant work.
What's really nice to see is your setup was almost hitting the stock ignition targets to start with.
For reference, here is the ignition target map and AFR target for the S65:
