Thank you for the input! Recognizing you have what I suspect is a bolt-on and tuned WRX, do you still find the SI fun? If so, that's speaks volumes.

I am admittedly a bit concerned about the Mustang's weight and lack of practicality without 4 doors. It may be a harder sell on my wife despite being $2-3K cheaper based on what I'm seeing right now.

I would very likely keep the SI stock, sans maybe a resonator delete (assuming they should good with the SI, I liked the farting with the STs) and a tune a year or so later. My largest concern is people's review of the clutch/shifter. That's generally where Honda shines, so it surprises me that there's complaints.