Power by stage
Stock is Hyundai's figure. Stage 1 to 3 are the tuners' own claims, mostly UK rolling-road figures in bhp; none of them says whether its figure is at the engine or the wheels, and they measure a stock car at about 190–198 bhp. Stage 2 and 3 figures are on 97–99 octane. We found no parts for a built engine, so there is no Stage 4 figure.
Names with an arrow go straight to that part's product page for this car. Names in a dashed outline are other brands that make the part; exact links for them are being added.
Software only
220–235 hpA remap on a standard car claims about 220–235 hp, with torque rising from 275 Nm to 325–386 Nm. Most are done on the tuner's own rolling road. Plug-in modules add less and change nothing permanently.
Typical cost: remaps £359.99–£595 (Forge, K-Tec, Courtenay Sport) or €590 (BR-Performance); plug-in modules £189.99 (Bluespark) or €449 on sale (RaceChip).List prices, Sept 2026, before shipping, import tax and fitting.
Stage 1 tunes compared
| Tune | Fuel | Claimed power | Claimed torque | Notes |
|---|---|---|---|---|
| Courtenay Sport Stage 1 | — | 235 bhp | 284 lb-ft | From 197 bhp on its rolling road |
| K-Tec Racing remap | — | 232.6 hp | 386.1 Nm | From 195.6 hp on its dyno |
| Forge Motorsport Stage 1 | — | 230+ bhp | 337 Nm | Done at Forge; the page shows a "discontinued" banner |
| BR-Performance Stage 1 | — | 225 hp | 325 Nm | 2-year warranty; says emission standards are kept |
| Bluespark Pro Petrol | — | 234 PS | 312 Nm | Plug-in module |
| RaceChip GTS 5 | — | +31 hp | +87 Nm | Plug-in module, 2-year engine warranty |
Intercooler, intake and exhaust
240–251 hpStage 2 adds a bigger intercooler, an intake and exhaust work with a Stage 2 map. Forge claims 251 bhp and 403 Nm and calls the intercooler and exhaust "essential"; Courtenay Sport claims about 250 bhp on 99 octane and needs at least 97.
Typical cost: Courtenay Sport Stage 2 package £1,933.50; intercooler £370.83–£839 (K-Tec, Airtec, Forge, Wagner); intake and inlet £262.02–£349.50 (Forge, Pipercross); HJS ECE downpipe £1,561.20.List prices, Sept 2026, before shipping, import tax and fitting.
Stage 2 packages compared
| Package | Fuel | Claimed power | Claimed torque | Required hardware |
|---|---|---|---|---|
| Forge Stage 2 | — | 251 bhp | 403 Nm | Forge intake, inlet and intercooler; full exhaust with sports cat and downpipe |
| Courtenay Sport Stage 2 | 99 RON (97 minimum) | about 250 bhp | 285 lb-ft | Pipercross intake, Wagner intercooler and map |
| BR-Performance Stage 2 | — | 240 hp | 350 Nm | Sports-cat exhaust with the filter removed, BMC filter |
Parts list
- Intercooler required
Forge intercoolerWagner Competition intercoolerAirtec intercoolerK-Tec intercooler
Forge measured 32°C air into the engine against 44°C stock, and up to +25 bhp at 4,500 rpm.
- Intake and turbo inlet required
Forge induction kitForge turbo inletPipercross induction kit
Forge calls the stock turbo inlet the key restriction; together its intake and inlet claim +12 bhp and +20 Nm.
- Downpipe recommended
HJS ECE-approved downpipe with sports catMilltek downpipe (race)
HJS's is the only downpipe we found that is E-marked for road use and fits particulate-filter cars.
- Exhaust optional
Remus EC-approved axle-backScorpion GPF-backMilltek
Scorpion measured +7.2 bhp from its GPF-back system; Remus's is EC approved.
Hybrid turbo and clutch
280–300 hpStage 3 is a hybrid turbo. Courtenay Sport's Stage 3 claims 280 bhp on its TÜV-certified development car, and says customers with full exhausts make about 295 bhp, the best 298, on 99 octane. Its CSR320 turbo alone claims 290–300 bhp with its intake and a Wagner intercooler.
Typical cost: Courtenay Sport Stage 3 £2,495 or CSR320 turbo £1,797; Muchboost hybrid €1,381.30–€2,031.71; uprated clutch £1,469.27–£1,836 (Xtreme).List prices, Sept 2026, before shipping, import tax and fitting.
Turbo upgrades compared
| Kit | Fuel | Claimed power | Claimed torque | Notes |
|---|---|---|---|---|
| Courtenay Sport Stage 3 | 99 RON (97 minimum) | 280 bhp | — | Hybrid turbo supplied, fitted and mapped |
| Courtenay CSR320 hybrid turbo | 99 RON | 290–300 bhp | 305–310 lb-ft | A new genuine Hyundai turbo with a bigger billet compressor wheel |
| Muchboost hybrid | — | "potential ~300HP" | — | Your turbo upgraded, or a complete one |
Parts list
- Hybrid turbo required
Courtenay CSR320Muchboost hybrid
Muchboost says 300 hp needs fuel, exhaust and cooling upgrades too.
- Uprated clutch required
Xtreme heavy-duty clutch (600 Nm)Xtreme race clutch (660 Nm)
Hyundai publishes no torque limit for the clutch, and Stage 3 files run about 413–420 Nm.
Built engine
no verified partsWe found no maker selling forged internals, a built short block or a big-turbo kit for the i20 N's 1.6, so we don't give a Stage 4 figure. If you want to go past Stage 3, find a shop that has built one of these engines before and can show its results.
Watch: real builds
From tuners', shops' and motoring journalists' own YouTube channels. Nothing loads from YouTube until you press play.
Questions to ask the shop
- How do you read and write this engine computer, through the port or on the bench, and do you keep my original file?
- Was your file developed on an i20 N on your own dyno, and what does it make on 95 and on 98?
- Does it keep the catalyst and particulate filter working with no fault codes, so the car passes inspection? Which parts are E-marked?
- What peak torque does it run against the stock 275 Nm, and from what point do you insist on an uprated clutch?
- Do you log intake-air temperature and knock, and at which stage do you require a bigger intercooler?
- What warranty do you give on the tune or the engine?
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