The Ford Fiesta ST Mk7 is one of the most modified hot hatches in the UK. The platform responds well to exterior work, there’s a strong aftermarket behind it, and the owner community is active enough that most modifications are well-documented before you commit to them. This post covers the most popular exterior upgrades for the Mk7 and Mk7.5, including the ST180 and ST200, with a focus on the finishing touches that make the biggest visual difference.
Why the Fiesta ST Mk7 is a strong base for modifications
The Mk7 Fiesta ST ran from 2013 to 2017, covering the ST180 (1.6 turbo, 182hp) and the limited run ST200 (1.6 turbo, 200hp). Both generations share the same basic exterior profile, which means most aftermarket exterior parts fit across the range. The car’s proportions – low roofline, wide arches, prominent front splitter – respond well to exterior modifications without needing dramatic changes to look right.
Rally Style Mudflaps
Rally style mudflaps are one of the most popular exterior mods on the Fiesta ST and one of the first things most owners fit. They protect the lower arch and sill area from stone chips and road spray, and on the right car in the right colour, they finish the look of the arches properly.
PolyWard makes precision-fit rally style mudflaps for the Fiesta ST Mk7 and Mk7.5 – covering the ST180, ST200, and the standard Mk7 and Mk7.5 variants, such as the S and base models (petrol and diesel). They’re cut specifically for this car’s arch profile from 4mm black PVC, are UK-made, and come with all fitting components. Universal mudflaps are available elsewhere, but the fitment on a vehicle-specific set makes a significant difference to how they sit and how long they stay put. For a closer look at mudflap options specifically, see the Fiesta ST rally style mudflap guide.
Sunstrips
A sunstrip is one of the lowest-cost, highest visual impact exterior modifications available for the Fiesta ST. Fitted across the top of the windscreen, a well-chosen shade in the right colour pulls the front end together and gives the car a more purposeful look.
PolyWard offers two versions for the Fiesta ST Mk7 and Mk7.5. The ST180 logo sunstrip includes a slick ST 180 detail and suits owners who want to mark the specific variant. The plain pre-cut version is a cleaner option if you prefer the look without the logo. Both are precision-cut to fit the Fiesta ST windscreen exactly – no trimming, no cutting around seals. Available in 11 colours.
If you’re unsure which shade works on your car, the legal limit for sunstrips in the UK is worth checking before you order. We’ve covered sunstrip MOT rules and the UK legal limits in detail here.
Side Skirts
Side skirts are a popular next step for Fiesta ST owners looking to lower the visual centre of gravity of the car. For the Mk7 and Mk7.5, Triple R Composites are widely regarded as the go-to manufacturer in the enthusiast community. Their ST-specific skirts are fibreglass, designed to work with the existing body lines, and are well-documented on the Fiesta ST Owners Club forums if you want to see real fitted examples before committing.
Wing Mirror Caps
Mirror caps are a small change that punches above its weight visually, particularly in gloss black or body colour. For the Fiesta ST Mk7, aftermarket mirror cap sets are widely available through eBay and specialist Ford parts sellers – search specifically for Mk7 or Mk7.5 fitment as the cap profiles can differ between generations. Carbon effect and gloss black are the most popular finishes in the ST community.
Wheels
Wheels are the single biggest visual change you can make to any car. For the Fiesta ST Mk7, the standard fitment is 17-inch alloys. Most owners who go aftermarket move to 18-inch wheels in either a deeper dish design or a lightweight track-focused option. The constraint worth knowing before buying: the Fiesta ST’s wheel arches are relatively tight, so tyre profile matters as much as rim size. Check fitment on the Fiesta ST Owners Club or SFOC forums before ordering to avoid rubbing issues.
Putting It Together
The most effective exterior builds on the Fiesta ST tend to follow the same logic: start with the details that protect and complement the existing lines before committing to more structural changes. Mudflaps and a sunstrip are low-cost, reversible, and make an immediate difference. Side skirts and wheels are higher commitment but higher impact.
For the PolyWard products mentioned in this post, see the full range of Ford rally style mudflaps and Ford pre-cut sunstrips — precision-fit, UK-made, available for the Fiesta ST Mk7 and Mk7.5 with various colours and logo options available.
Do you drive a Focus ST225 and are thinking about some of PolyWard’s rally style mudflaps as an upgrade? We have recently published the Ford Focus Mk2 ST225 Rally Style Mudflaps: Fitment Guide and Buyer’s Guide.
