I put in the new TB, gasket along with a new larger MAF with the new sensor included. It took at least 20 minutes for the car to settle in with stalling and restarting a half dozen times. Finally idled down to where it should be and smoothed out.
I noticed a different exhaust tone know and less of the deep throaty noise that I use to have from 3-5 grand. Now I hear more of a high air pressure noise coming out of the tailpipe... It completely changed my exhaust sounds - deleting some of the deep throaty noise under heavy acceleration. I did not do any time tests and couldn't really tell if the pickup was better.

I decided to put it all back for now and wait until next summer. When the old TB and MAF were installed and the throttle reset, it started and idled perfectly the moment I started it. I figured it would have to go through the air mixture process again but it did not.

I am more concerned with the exhaust tone than getting a couple of HP. If I really lose the tuned exhuast noise I will not use the larger TB. My XF exhaust noise sounds great stock and I would hate to lose that sound since it sounds more like a big bore than a 3.2L