Best Performance Mods for Your Ford ST or RS
Looking to upgrade your Ford ST or RS? Explore the best performance mods for UK cars including exhausts, remaps, intercoolers and more
Share This Post
If you have a Ford ST or RS model, chances are you’re already a performance junkie. But there’s always room for improvement. Below are some of the most popular performance modifications in the UK scene that can take your Ford to the next level.

ECU Remapping
Even just a stage 1 remap can totally transform your ST or RS, increasing power and torque and improving the throttle response. In the hands of a good tuner, it’s one of the best value-for-money upgrades available.
- Increased power
- Increased fuel economy
- Biggest power gain for the money
High-Performance Intercoolers
Especially worth considering for the turbocharged EcoBoost engines in the Mk7/8 Fiesta ST and Mk3 Focus ST/RS. A larger intercooler keeps intake temperatures low and prevents power loss when under load.
- They are a must for those running bigger power
- Increase longevity of your engine
- Keep IAT down
Performance Exhaust Systems
From cat-backs to full turbo-back setups, a performance exhaust does more than add power — it gives your Ford the dirty sound it was designed for. Manufacturers like Milltek and Scorpion are popular in the UK market.
- Less restrictive over OEM system, increasing the cars power
- Nicer sounding exhaust note
- Usually will be lighter than the stock system
Lowering Springs & Coilovers
Lowering your ST or RS increases road presence and handling. Eibach and H&R springs are popular for street use, with adjustable coilovers offering more control for track-focused projects.
- Lowering Springs are a cheaper alternative to coilovers, but don’t give you the adjustability
- Lower centre of gravity for better handling
- A more aggressive stance and road presence
Big Brake Kits
With more power, you’ll need better stopping power. Upgraded discs, pads and even full big brake kits (AP Racing, Tarox) are a must-have for spirited driving or track days.
- Greater stopping power is safer on and off the track
- With bigger an better brakes you will be able to brake longer and later than normal

Use a combination of modifications
Upgrading your Ford ST or RS is a rite of passage for many UK petrolheads. Whether you’re after lap times or just want a quicker daily, these performance parts can be the difference.
Feel free to drop us an email at sales@modcentraluk.com or message us directly on Instagram if you have any questions. We also have many companies up and down the country on our service finder who can offer performance services for your ST/RS