Just wondering, what update has Bob put into the Hahn 2X tune? Last time I spoke with Bob about it, he wasn't going to spend any time fine tuning that setup since there was no desire on the turbo supplier to share the costs of the tune. Has that all changed? Or have you changed any hardware items making a tune change warranted?
I don't really know what the new changes are. My Wife won't ride with me due to the smell of unburned fuel, so I emailed him asking if adding a high-flow cat to the turbo exhaust and to the waste-gate bypass, if necessary, downstream from the O2 sensors would have any negative impact to the tune beyond possibly increasing back-pressure. He responded saying the cat shouldn't affect the tune and that a flash upgrade might help with the smell issue. He might just be using a tune from a different setup, hopefully tweaked for the Hahn setup. IIRC, I have read some comments implying such a reflash has improved their tune, but I don't know any specifics about it. At this point, anything that makes the Wife happy will be good.
I've been thinking about having a local exhaust shop mod a side pipe exhaust kit to allow me to place a high-flow cat in the engine compartment feeding a larger diameter side pipe, say 3" or so. I'm still in the thinking about it stage, but if a reflash can help, I'll give it a try.