RS Bonnet Vents – Do i dare DIY?

RS Bonnet Vents – The Decision

I’ve always loved a vented bonnet right back from my days of owning a Ford Escort RS Turbo MK2 and upon my purchasing a Focus ST i knew i’d likely want to get some fitted… In my opinion they looked fantastic on the RS focus.

Watched a few videos on YouTube and read up where i could to see if my limited talent would be sufficient to fit them myself.

Decided i’d try mainly because i knew a replacement bonnet wasn’t too expensive if i messed it up.



Decision made i was now looking for the best place to get my RS Bonnet Vents.

Few places had them but in the end i found a set on Ebay that fitted the bill, also if needed i could buy the covers to fit underneath from the same place… Hit the buy it now button and sat back and waited for them to arrive.


Whilst waiting i had to remove the rather flashy under bonnet mirrors that had been installed to make way.

Luckily these came off easy and left very little mess… The vents arrived and i got straight on with getting the templates in place making ready for the outline to start cutting.

Still can’t believe i was gonna start hacking at my bonnet, made me feel a little sick at just the thought of it!


Cutting the Bonnet

After covering all of the engine bay, wings and windscreen it was time to take the plunge.

I’d bought a dremel cutting disc to use for the corners and tight stuff and also had a grinder with the finest cutting disc possible.

Put my safety specs on and leaned in to begin the first cut. vent-cut

Too late to stop now. I’d started with the dremel as it seemed far less harsh than a grinder but it took ages to get anywhere.

Anyway after what appeared to me was hours i’d got the first hole cut out, pretty neatly too if i do say so myself.

Quick cuppa and a few puffs of strawberry milkshake vape and i was ready for number 2… Done the next far quicker.

Ran a file over to smooth the edges and stood back to admire my work.

Fitting the RS Bonnet Vents

vent-in    vent-under

Tiger Seal in hand i started applying it liberally on the rear of the vents to make sure they would stick well in place.

Squashed them in place and tried removing the worst of the seal that had squelched out from around the sides.

Thought far easier to get off now rather than having to deal with it once dried.

Got some tubing and taped them across the vents to hold them down until the Tiger seal had dried off overnight.

Time to be patient and wait 24hrs for it all to set.


The Result

Woke up early next morning eager to see what all my hard work had come out like.

After removing the vast amount of tape i’d applied i was relieved and rather pleased at the result.


As always i welcome comments and any questions you may have.

Links provided for Vents i used..

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4 Replies to “RS Bonnet Vents – Do i dare DIY?”

  1. Hey thank you for the awesome post!  You did a pretty good job at that!   Are you self taught or did you learn from someone else?  Also, if someone else wanted to do something like that, do you think that one should look elsewhere first before buying from ebay?  Was the quality good?  I have heard bad things from ebay, and believe it or not, I have never used ebay before.

    1. Hi, Thanks for your comments, Really appreciated.

      I’m pretty much self taught with the help of an odd youTube video here and there.. 

      Generally i’ll have a go first as that’s why i enjoy about modifying cars. Anyone can pay someone else to do it!

      Also the aim of site is to help people who wish to engage with DIY on their cars and i’ll gradually be adding more and more how to’s.

      Now as far as buying from ebay goes i have to say i’ll only buy from people/businesses on there if they have good feedback. In all the hundreds of products i’ve bought via ebay i can’t recall any that have been of poor quality.

      Take the plunge and get yourself an account, you’ll save money on what you’d pay on the High street.



  2. Rob,

    You definitely have a love affair with cars. I feel your passion. It’s interesting that here in the states bonnet vents are known as hood vents.

    I was wondering if your vents were installed for performance, or for a cool look, or both?

    And if I was going to have someone else install, any thoughts on cost?


    1. Hi, JR

      Thanks for taking the time the look through.

      They were installed for both the reasons you’ve mentioned. The cooling of the engine and also for the looks.

      If done yourself it’s a very cheap upgrade with quite a dramatic difference to the overall look of the car.

      Now if this is done by a Professional Installer which by the way are few and far between in the UK it would cost in the region of £150 or approx $200.

      It’s still a pretty economical upgrade but i just prefer to try things myself as long as it looks within my capability.

      Once again thanks for your interest and questions


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