4-0300 Symposer Delete with Pressure Port compatible with 2013-2018 Ford Focus ST ST250

Quality part, great instructions, and got rid of that awful whistling on my 2017 Focus ST after my Green filter install. Easy to install!

I didn't hate the sound symposer, but after replacing the factory air filter with a green filter, I didn't want the symposer to drown out the more pronounced intake and turbo sounds after the filter swap. So I decided to delete it. This kit did the trick perfectly. I especially like that it came with the option of an additional vacuum source if I need it down the road. Plus the engine bay looks much less cluttered and cleaner losing all the hardware associated with the symposer system.

I don't doubt CFMs quality as I have a couple other parts from them and have had no issues, but be aware that not everything works 100% of the time. Yesterday I noticed after getting off the highway that my engine was revving up and down (between 1 and 2k rpm). I had no idea what it was and thought it was some problem with the computer / throttle sensor. I got home and noticed some smoke and a slight burning smell. Asked around and did some Googling, found a couple suspects but nothing solid so I decided I was going to call a mechanic the next morning. However, later that night I looked around a bit more in the engine bay and noticed *gasp*, the NPT plug in the symposer delete was missing! Got a cheap replacement plug from the hardware store and all of the problems went away. So, lesson learned is to be aware of what a boost leak is like (this was a BIG boost leak, too), and to make sure you check aftermarket parts for issues first. I have no idea why the old plug went missing but I assume it just got loose after about a month of driving (maybe it wasn't tightened well enough from the factory). Regardless, this symposer delete held up pretty well so far so I have no complaints.

The product is overall good, made in America, and even comes with instructions. My only complaint is that the Barb fitting is plastic instead of brass like other companies. If you were going to use this fitting as a temporary vacuum source for intake valve cleaning it would be fine but I would not use it as a permanent boost source.

easy to install and it fits great. It comes with a fitting for when you want to run a true vaccum line to the bov, worth it if you want to clear up some space in the engine bay

It definitely makes the inside of the vehicle a lot more quite. Plus it cleans up the engine bay by removing plastics tubes. Took maybe 45 minutes

My son and I put this on taking off the piped in sound. We followed the directions and it has fits and works as designed. If you add a blow off valve, or bigger turbo, large cold air intake and/or exhaust mods, this will greatly enhance your experience. If you aren't planning any of these mods, you may want to rethink removing this. As horrible as it is to have fake sounds, they are kind of cool sounding after you remove it without these mods.

Used this kit to delete the symposer on my 2017 for focus st. Simple install, takes less than 20 minutes, could be done in 5. No more garbage autotuned engine noise, I can now here the engine.