SKU: 29729655489

Airtec Stage 4 Intercooler Upgrade for Mk2 Focus ST

Sale price$501.75 Regular price$557.50
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Ships within 48 hours · Estimated delivery Aug 14 - Aug 19

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Description

Airtec Stage 4 Intercooler Upgrade for Mk2 Focus STAs part of our expanding Focus RS product range, AIRTEC Motorsport is proud to launch our Stage 4 intercooler upgrade suitable for track or fast road use. In order to ensure there is no noticeable loss in performance during extended periods of hard driving, we have taken our hugely popular Stage 1 Focus RS intercooler and modified it to fit within the ST bumper and modified our 2. 5 big boost pipe kit and modified it to fit the Focus ST turbo. Our

As part of our expanding Focus RS product range, AIRTEC Motorsport is proud to launch our Stage 4 intercooler upgrade suitable for track or fast road use.

In order to ensure there is no noticeable loss in performance during extended periods of hard driving, we have taken our hugely popular Stage 1 Focus RS intercooler and modified it to fit within the ST bumper and modified our 2.5″ big boost pipe kit and modified it to fit the Focus ST turbo.

Our solution to increasing the intercooler’s size and performance within the confines of the limited space behind the bumper is based upon a 60mm core that’s twice as high and almost 100mm longer than the standard item. This offers a massive increase in overall capacity in comparison to the original intercooler, as well as a 127% increase in frontal area over standard, which allows it to make the most of the air flow provided.

Together with our high-flow end tanks and air diverter scoop to ensure flow is directed correctly and efficiently, the AIRTEC Motorsport intercooler offers much greater efficiency and volume over standard.

Matched with our 2.5″ hard boost pipe upgrade that replaces the OEM 2″ pipework. Increasing the dimeter reduces restriction and improves flow, which in turn sees an instant increase in power, as seen during back-to-back dyno testing which saw a huge 11.8bhp and 9lb ft of torque gain simply by fitting the new pipework.

Features:

  • Huge high flow 60mm core
  • 127% increase in frontal area for improved air flow
  • Air Ram Scoop forces air directly into core of intercooler
  • Smooth-flow end tanks
  • AIRTEC logo brackets
  • 2.5″ pipe work improves flow
  • Increased BHP & torque
  • Pro-Series Black or Natural Silver
  • Strongest intercooler available, backed up by our 3-year warranty

Please note: Pipework only available in Pro-Series Black

Important Note: The Pre-facelift ST has a different radiator compared to the facelift & RS, this makes the left hand cold side silicone hose very tight against the radiator cradle. We recommend removing the radiator cradle bolt, levering the cradle to the right and re-drilling a new hole & then replacing the bolt. It’s very simple and easy to do, but is necessary to give you extra clearance for the bigger 2.5″ cold side hose. If you are still not happy with the fit, we would recommend fitting an RS radiator.

 

PLEASE SPECIFY COLOUR OF SILICONE HOSES IN THE COMMENT BOX AT THE CHECKOUT. AVAILABLE OPTIONS:

Gloss Black
Performance Blue
Race Red
Frozen White (MADE TO ORDER - Please allow 2-4 weeks)
Bright Yellow (MADE TO ORDER - Please allow 2-4 weeks)

Orange (MADE TO ORDER - Please allow 2-4 weeks)
Grey (MADE TO ORDER - Please allow 2-4 weeks)
Ultimate Green (MADE TO ORDER - Please allow 2-4 weeks)
Purple (MADE TO ORDER - Please allow 2-4 weeks)

      Shipping Notes
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      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 29729655489

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      Barry Vercueil
      Lexington, US
      ★★★★★ 5
      Amazing Solar for the price
      Color: Black/Orange, Color: Black/Orange
      Great watch. Very good visibility. Ligh and feels quality. Easy to swap straps. Same size as my Casio Duro. Highly recommend.
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      Reviewed in the United States on April 30, 2026
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      Jason G
      Natrona Heights, US
      ★★★★★ 1
      Do not buy
      Color: Green/Black
      Do not buy. When I received the watch it did not work and the battery was dead. I bought a new battery and it killed that one as well after about a month.
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      Reviewed in the United States on March 18, 2026
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      Miles Connell
      West Palm Beach, US
      ★★★★★ 5
      Inexpensive doesn’t mean cheap.
      Color: Black/Orange
      After 10 months, zero complaints. Well, I got rid of the horrible NATO strap 🙄. That’s a personal preference. Easy to swap out to whatever you like. Keeps accurate time meaning it’s the same time. I’m not micro analyzing it and the seconds gained/lost. It has a confident look and feel and makes you feel good when wearing it. Sure it’s not high priced but it’s not cheap. Very comfortable, light and not unincumbered. If this is what you’re looking at, you’d be satisfied. Great looking, durable and simple watch. Full confidence.
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      Reviewed in the United States on October 25, 2025
      B
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      Buyer
      San Leandro, US
      ★★★★★ 3
      Budget Seiko Prospex this is not
      Color: Black/Orange
      Bought this as a cheap work watch, but I guess all the budget went into the solar technology. No date adjust feature, gotta crank the crown over and over to adjust the date. (Also no screw-down crown, but that's expected at this price) Fake diver bezel. Lol why? Cringe as heck. Should of just put a compass bezel on there instead tbh. Cheap plastic crystal, scratches and mars just by looking at it. Okay NATO strap. Falls apart quickly, but it's easily replaceable with a better quality one. Decent lume on the hands, but none on the hour markers even though it looks like there is. Looks cool.
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      Reviewed in the United States on June 13, 2025
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      Michael Miracle
      Charlottesville, US
      ★★★★★ 5
      Simplicity
      Color: Black/Orange
      This watch was received exactly as advertised. First off the watch is economical compared to other watches that advertise the same details. I will say that I have gone through numerous Luminox watches only to be disappointed. This watch fits the bill. It does have solar cells which mean it needs to be exposed to light to keep running, not a problem. Three minutes under my surefire light I am golden. The bezel doesn't rotate actually no big deal for me. I have always required that the bezel moves not anymore after having a bezel that rotates I use it next to never. Here's why, the more I rotate the bezel the more the numbers wear off. The strap on the watch with the catches for the strap are perfect. They actually hold the watch strap in place in lieu of like other big name brands that just flop and slide. As far as everyday use goes this watch is my go to. To be honest I have purchased three. This is the only watch I will wear moving forward, yeah the glass my scratch but even the big names like the Luminox I spoke of earlier scratches too.
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      Reviewed in the United States on April 4, 2026

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