I've just started to modify my connect, and I've started with just a couple of small things under the hood.
1. Focus RS Air Box: Before anyone goes and points out that the lid dosen't seal to the bottom of the hood, look at the K&N air filters with the open ends, same effect, hot air. Simple fix, drive faster. lol. It is a very noticeable increase in throttle response and overall performance. Probably less than 5hp, but still noticeable. I've also noticed about a 3mpg increase since the installation which includes a K&N Air filter.
Price: ~$60.00
Link: http://www.trueblueracingparts.com/16-FORD-FOCUS-RS-AIRBOX_p_555.html
The air box comes with an OEM paper air filter, but any 2012+ ford focus air filter will work as they are all the same. Standard, ST, RS, all identical. Pick your poison.
2. Mountune Silicone Induction Hose: The red thing. Didn't really notice any real increase with this, but just by observation alone, this piece will create far less turbulence than the OEM rubber corrugated hose. I say it adds visual horsepower, because we all know, red stuff under the hood means power. lol
Price: ~$69.00
Link: https://www.mountuneusa.com/mountune-High-Flow-Induction-Hose-Focus-ST-p/2363-ih-blk.htm
3. Fiesta ST Engine Cover; It was a direct fit. I hated the original engine cover. So boring. Since it's the identical engine as the FiST anyways, less the tune, might was well wear the proper hat.
Price: ~$45.00
Link: https://www.powerstrokeplus.com/oem-parts/ford-engine-cover-c1bz6a949b?origin=pla&gclid=Cj0KEQjwmcTJBRCYirao6oWPyMsBEiQA9hQPbu8PPdPHVm4Xbt085j2FpE4qswgd8lHAapEyIMiWqOUaAifB8P8HAQ
4. Boomba Bypass Valve Adapter for Fiesta ST: Simple and easy install with only three bolts. I didn't even have to remove the wheel to get to it. Now my van goes PSSSHHHHH and everyone that hears it looks so incredibly confused. I love it! I will say, that since the bypass valve is electronically controlled, it does go off a bit too much. It's sensitive enough to blow off in my driveway in the morning at idle when it goes from cold to warm cycle. Turbosmart does make one for the Fiesta ST that will also bolt up, but converts it to vacuum controlled versus electronic.
Price: ~$85.00
Link: http://www.boombaracing.com/1-5-1-6-ecoboost-engine-50-50-blow-off-valve-adapter-bov/
From what I've gathered, I can see that it's a Fiesta ST Engine in a Focus engine bay. More parts are on their way, but I won't post until I confirm fitment.