Modified Ford Focus RS for Sale in the UK
The Mk3 Ford Focus RS is widely regarded as one of the most exciting hot hatches ever built. With 350bhp from the factory, a 2.3-litre EcoBoost turbocharged engine, an AWD system capable of factory drift mode, and Quaife differentials as standard, the Focus RS arrived as a serious driver's car that the modified car community immediately embraced.
Modified Ford Focus RS models for sale in the UK range from lightly tuned stage 1 examples producing around 380–400bhp, to full big turbo stage 3+ builds with 500bhp and beyond. The 2.3-litre EcoBoost shares its architecture with the Mustang EcoBoost, giving tuners confidence in its long-term strength and an extensive knowledge base for high-power applications.
The RS's Drift Mode — which electronically transfers torque to the rear axle while applying brake vectoring — has become a key attraction for owners interested in controlled oversteer events and track days. Modified RS examples with upgraded suspension, wider wheels and tyres, and increased power make for genuinely formidable track day weapons.
On Madlows, you'll find a curated selection of modified Ford Focus RS models listed by enthusiast owners and specialist dealers. Each listing includes detailed modification information so you can evaluate exactly what work has been carried out. Browse live Focus RS listings and contact sellers directly through the platform.
Modified Ford Focus RS Listings
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List your Focus RS todayPopular Ford Focus RS Modifications
Already an exceptional platform from the factory, the Mk3 Focus RS responds well to tuning with a wide range of aftermarket support available.
Engine & Power
- • Stage 1 ECU remap (380–400bhp)
- • Stage 2 intercooler & downpipe (420–440bhp)
- • Big turbo conversions (500bhp+)
- • Upgraded intercooler systems
- • High-flow downpipes & exhausts
- • Fuelling upgrades (port injection)
Drivetrain & Handling
- • Quaife ATB differential upgrades
- • AWD drift mode tuning
- • Coilover suspension kits
- • Upgraded brake kits (Brembo, AP Racing)
- • Wider wheel and tyre packages
- • Head gasket replacement & upgrades
Ford Focus RS Buyer's Guide
Head Gasket Recall
Confirm whether the head gasket recall (TSB 16-0159) has been carried out by checking with Ford using the vehicle's VIN. Unaffected cars, or those with documented recall completion or upgraded head gasket fitment, represent more secure purchases. Signs of head gasket failure include white smoke from the exhaust, coolant loss, or oil contamination.
Drift Mode Usage History
Drift mode places significant stress on the drivetrain, differentials, tyres and brakes. Ask the seller whether the car has been used on track days or at drift events, and check for tyre wear patterns, brake wear, and any signs of drivetrain stress. Rear suspension components and wheel bearings may show accelerated wear on heavily used examples.
Big Turbo Build Verification
High-power Focus RS builds require comprehensive supporting modifications including upgraded fuelling, an appropriate intercooler, and a custom ECU tune. Ask for dyno sheets, invoices from the tuning company, and evidence that all supporting modifications are properly installed. Generic or unknown ECU tunes on high-power builds should be treated with caution.
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Frequently Asked Questions — Modified Ford Focus RS
What is the head gasket issue on the Mk3 Focus RS?
A proportion of Mk3 Ford Focus RS models suffered head gasket failures, particularly on early production cars. Ford issued a recall (TSB 16-0159) to address the issue. When buying a used Focus RS, confirm whether the head gasket recall has been completed — verifiable through Ford's customer service using the vehicle's VIN. Reputable modified RS models should either have documented recall work or a replacement head gasket fitted as part of a higher-power engine build.
How much power can a modified Focus RS produce with a big turbo?
The Mk3 Focus RS's 2.3-litre EcoBoost engine is a strong platform for forced induction builds. Stage 1 maps raise power from the standard 350bhp to around 380–400bhp. Stage 2 builds with upgraded intercooler, downpipe and fuelling push to 420–450bhp. Big turbo builds with a hybrid or full turbo swap, upgraded fuelling and a custom map have been known to produce 500bhp+, though at this power level significant engine internals work is typically required.
What makes the Focus RS unique compared to other hot hatches?
The Mk3 Focus RS is unique in offering a factory drift mode — an electronically controlled AWD system that can send up to 70% of torque to the rear wheels while simultaneously applying opposite-side braking to induce controlled oversteer. This, combined with 350bhp from the factory, made it one of the most capable and exciting hot hatches ever produced. Its 2.3-litre EcoBoost engine, Quaife differentials, and track-tuned suspension give it genuine performance credentials.