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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

Previous | Showing reviews 11-20 of 25 | Next

  1. Perfect! 5 Star Review

    Posted by on 16th Jul 2016

    Great fit and finish. Easy to install. The rubber plug for the symposer input line is a nice touch although I removed the line completely for less clutter. Great product!

  2. Great product 5 Star Review

    Posted by on 6th Jul 2016

    Finally 2 years later I've purchased the Sound Symposer Delete Kit.
    Well made product easy to install, except trying to get to the one bottom clamp it took awhile and a few cuts on the hands.
    Finally the fake exhaust sound is gone, it sound much better driving in the city and I no longer have to listen to that annoying sound cursing on the highway at 75mph.
    I just can't believe I waited 2 years to buy it.

  3. ehhhh 4 Star Review

    Posted by on 27th Jun 2016

    Pretty good, my tabs were twisted around so it was hard to put on

  4. Awesome product 5 Star Review

    Posted by on 5th May 2016

    Well first off Boomba sent this really quick which awesome. The product itself looks awesome and durable. Installation was simple and straight forward. Love how they had a installation video. I can hear everything inside my car now without rolling down the windows..BOV, turbo, exhaust, everything. Great product and highly recommend.

  5. More natural engine noise 5 Star Review

    Posted by on 12th Feb 2016

    Great finish (went red anodize), easy enough to install (except for the weird angle at which the hose clamp towards the front of the engine block, made it difficult to open on my 16 FiST). Removes that monotonous "drone" that the symposer creates, ordered at the same time as my BOV adapter and i couldn't have a bigger grin

  6. Big difference! 4 Star Review

    Posted by on 1st Feb 2016

    I am really happy with the sound difference. Love the natural sound of the ST engine. Quality is great. The red looks a little maroon though. Overall, must have product.

  7. Did it myself 5 Star Review

    Posted by on 7th Jan 2016

    Great product. I was expecting a very quiet ride based on other reviews but that wasn't the case (a good thing). The drone is gone and the OTT symposer sound at WOT is gone but there's still a nice engine note, which I like.

    I installed the kit myself using long reach pliers with 90 degree bend as mentioned below. But first I disconnected the hose that doesn't have a clamp and also disconnected the symposer from the engine. This enabled me to push/pull the symposer aside so I could get to the annoying clamp. Also, as mentioned below, the clamp was glued or welded to the hose so I couldn't push it down the pipe. I ended up fully clasping the clamp so it was permanently open in the same spot on the hose, then simply reclamped it once the plug was in. I suppose with two people doing the installation, one could open the clamp to loosen the pressure (and hold it there) and the other could pull the symposer out. It took me about 10min to get the technique right on my own but I got there in the end. Hope this helps others.

  8. Overall great 4 Star Review

    Posted by on 2nd Dec 2015

    The quality of the delete kit is great, and I can't believe how much better the car sounds without the symposer. I was afraid it would be super quiet, but it sounds exactly the same but without an annoying drone. The only issue I had was with installation, which accounts for the 4 star review. Like another reviewer said, the installation video is very misleading as far as removing the bottom clamp. The clamp squeeze point is pointed in a direction that makes it very difficult to access. I ended up bringing this 'simple' kit to a performance shop for install because I could not get the clamp removed on my own.

  9. Need special hose clamp pliers 4 Star Review

    Posted by on 6th Nov 2015

    This symposer delete kit is high quality and works as advertised. Shipping was prompt. The car runs much quieter, even at extended WOT on a stock 2016 Fiesta ST.

    I would give 5 stars, but the problem was installation. The hose clamp which has to be loosened was difficult to reach and its tabs are hard to see. Boomba's installation video is misleading. It shows the clamp rotated from the factory position, making its tabs visible and easily squeezable. Regular pliers will not reach. I bought a cable-based flexible hose clamp pliers, but it broke. The clamp required more pressure to loosen than the cable pliers could deliver. I had to ask for help from my mechanic, who has long pliers with a bend (similar to the one referred below). I pushed the symposer aside to give him clearer access, and held a light for him. So it was a two-person job. Once that clamp was rotated, the rest was easy.

  10. nice product 4 Star Review

    Posted by on 20th May 2015

    Very nice product. Very impressed with shipping 2days! The video installation looks so easy! Its pita to get the clamp to move down specially if its turned around once the symposer is off piece of cake. I definitely like the natural sound of the vehicle with windows down hear more spool and turbo but with windows up its quiet other than Cobb drop in filter I'm stock so some guys may dislike it. I did it because I hated the drone of the symposer plus its stupid IMO.

Previous | Showing reviews 11-20 of 25 | Next

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