I bought a 2nd aero bumper and got it painted and installed lightyears faster than the AJ4 aero bumper...which is still with a friend in another city...
After talking with mav1178, I'm really considering putting both cars on the Nismo suspension. Going to a track day in May is still the goal, but the BN5 car inspection is due the same month. I might just revert it to OEM and tool around in the AJ4 car. If I put the stock wheels back on and get the Nismo suspension, I'll most likely get the OEM rear pods put on as well.