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FIESTA ST Sound Symposer Delete

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Product Description

Installation Manual


This direct bolt-on kit deletes and blocks the sound symposer from your 14+ Fiesta ST, cutting off the artificial drone noises being directed into the car's cabin, instead allowing you to hear your engine and exhaust tones as they should be. Included is this kit are an aluminum block-off plate and a delrin hose plug, both of which are precision CNC machined from high quality material with laser engraved Boomba logos.


The block off plate features a threaded 1/4 NPT port and plug, allowing for allowing the end user to connect whatever aftermarket accessories they desire, such as our in-development catch can. This kit is also must-have for those higher horse power builds, where the increased boost levels could break the internal diaphragm of the OEM symposer components and cause boost leaks. Installation is simple and as well as completely reversible.


The block–off plates are available in Natural aluminum as well as black, red or blue anodized. 






Product Color Disclaimer
Due to variances in the anodizing stage of production that are beyond our control, actual color hue may be different than what is pictured and what has also been previously offered by Boomba Racing. We apologize for any inconvenience and we sincerely appreciate your understanding. For further clarification, feel free to contact us.

Product Videos

Boomba Racing Fiesta ST Symposer Delete Installation (02:12)
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Product Reviews

Showing reviews 1-10 of 25 | Next

  1. Excellent! 5 Star Review

    Posted by on 5th Jun 2018

    Great product !One of the only ones that comes with the firewall side hose cap. Quiets down the interior noise a lot.

  2. No Artificial Sound 5 Star Review

    Posted by on 19th Feb 2018

    Enjoy hearing the engine and no amplified noise.
    Recommend adding an addendum to the YouTube Video that is you are unable to remove the sound imposer from the rubber hose even after removing the clamp, just use a box knife to cut the hose just below the imposer.

  3. Awesome looks cool 5 Star Review

    Posted by on 12th Sep 2017

    Very nice kit. Easy to install and looks great. No more droning on the interstate and I am very satisfied with this product. Will be looking at more Boomba products in the future

  4. stop the madness!! 5 Star Review

    Posted by on 7th Jun 2017

    i now have piece and quiet, nice product. i would recommend getting the hose clamp tool as i used vise grips but its well worth the effort.

  5. Should have installed this sooner! 5 Star Review

    Posted by on 26th Apr 2017

    Simple install that makes a huge difference! No more excessive cabin noise which makes for a much more pleasant driving experience. Love the way it looks too.

  6. easy to install and gets rid of the drone 5 Star Review

    Posted by on 24th Apr 2017

    Can you not stand that awful drone when pressing on the go pedal? I couldn't either. Why did Ford try and be like BMW, plumbing sound into the cabin? We'll never know.

    The kit was easy to install. I did it in the dark in all of 10 minutes. And no more terrible drone!

  7. Easy install, instant results. 5 Star Review

    Posted by on 5th Dec 2016

    Installed a catless downpipe earlier in the year and ever since, the noise through the factory symposer has been god awful and at some times almost unbearable. Installed the symposer delete this past Friday and besides the factory hose clamp being installed where I needed an actual hose clamp tool to get to it, install was easy and took less than five minutes. Almost immediately I noticed that while I was hearing more noise from the exhaust and the Boomba BOV spacer, there was no longer that annoying gurgling present under light throttle at times. For $40 and less than a 5 minute install, this symposer delete was worth the time and money spent.

  8. Perfect, does its job. If you don't have 45 degree pliers, read on 5 Star Review

    Posted by on 11th Oct 2016

    Great little mod. Tight seal, no leaks, looks good in the engine bay. You're paying for quality here, go for it.

    If you don't have angled pliers, remove the entire hose section via the hose clamp at the charge pipe connector. It's about 4 inches below the clamp in the video.

    That'll help you wrangle the sound symposer out without much drama. Or just go to a hardware store and get the angled pliers for cheap.

  9. Quality part, quality finish, perfect fit 5 Star Review

    Posted by on 26th Aug 2016

    Couldn't be happier. Quality parts. I recommend this to anyone looking to remove the sound symposer from their car.

  10. Needed info not in you tube vid 5 Star Review

    Posted by on 25th Jul 2016

    The delete is amazing once you start modifying. The quality of the Boomba product is spot on.

    The instructions are close(the you tube vid.) DO NOT attempt this install with out 10-11" 45 degree angled pliers. Also in my car, I needed a little wd40 to get the plastic box out.

Showing reviews 1-10 of 25 | Next

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