HOWELL PERFORMANCE
UK ECU performance specialists

Expert ECU tuning, posted to your door.

Send us your ECU or module and we develop a bespoke calibration on the bench — fully backed up, bench-tested and validated before it comes back to you. Tracked every step of the way, anywhere in the UK.

Live tracking
HP-24819
Audi S3 8V · 2.0 TFSI
Stage 2 · Continental SIMOS 18.1
In calibration Stage 5 of 8
+76
bhp · 296→372
+100
Nm · 380→480
Track yours
Free prepaid postage Full backup before any work Bench-tested before return Plug-and-play
What we do

A specialist calibration house — by post, across the UK.

Performance tuning

Bespoke Stage 1 & Stage 2 calibrations that sharpen response and lift power and torque across the rev range — refined, road-friendly and reliable.

Emissions solutions*

DPF*, EGR* and AdBlue/SCR* solutions for motorsport, off-road and export applications — handled with the same rigour as every calibration we develop.

Mail-in, nationwide

No appointment, no travel. Post your ECU or module to our bench and we return it ready to refit — fully tracked and insured, door to door.

The tracked mail-in experience

Every stage visible. Every unit tracked.

From the moment you order to the moment you plug back in, you can see exactly where your unit is — and what we're doing with it.

01
Order online
Choose your service and confirm your vehicle in minutes.
02
Free prepaid label
A tracked postage label lands in your inbox straight away.
03
Received & photographed
We log your unit in and photograph it on arrival.
04
Read & backed up
A full backup of your original calibration is archived.
05
Custom calibration
We develop a bespoke map for your exact hardware.
06
Bench tested
Checksum-corrected, validated and verified before return.
07
Tracked return
Sent back by tracked, insured courier with live updates.
08
Plug back in
Refit, start up and enjoy your new calibration.
Live tracking
Try a sample:
Order
HP-24819
Vehicle
Audi S3 8V · 2.0 TFSI
Service
Stage 2
In calibration Stage 5 of 8
PROGRESS TIMELINE
1
Order placed online Complete
Service selected and order confirmed.
16 Jun · 14:08 Email + SMS sent
2
Prepaid postage label issued Complete
Free tracked label emailed to you.
16 Jun · 14:09 Email + SMS sent
3
Unit received & photographed Complete
Logged in and documented on arrival.
18 Jun · 09:42 Email + SMS sent
4
Bench read & full backup taken Complete
Original calibration archived securely.
18 Jun · 11:20 Email + SMS sent
5
Custom calibration developed In progress
Tuned to your exact hardware on the bench.
19 Jun · 15:05 Update on the way
6
Bench tested & validated Pending
Checksum-corrected and verified.
Notification scheduled
7
Tracked return shipping Pending
Sent back by tracked, insured courier.
Notification scheduled
8
Plug back in & drive Pending
Refit, start up and enjoy.
Notification scheduled
Before / after — bench projection
DYNO
0100200300400 140280420560 1357 RPM × 1000 bhp Nm
Stock After tune Torque
+76
bhp · 296→372
+100
Nm · 380→480
● REC
Unit received
Audi S3 8V · 2.0 TFSI
On receipt · 18 Jun, 09:42 · 4 photos
Identified & backed up
ECU / software
Continental SIMOS 18.1
Software version
8V0906259H · 4985
Original calibration archived
Estimated dispatch
Fri 27 Jun
Tracked & insured courier
Notifications 4 sent
Email updates On
SMS updates On
Why mail-in with us

Done properly, with nothing left to chance.

Full backup first

Your original calibration is read and archived before a single change is made — so we can always restore it.

Bench tested before return

Every calibration is checksum-corrected and validated on the bench, so it's right before it leaves us.

Tracked both ways

Free prepaid postage to us and tracked, insured shipping back — with live updates at every stage.

Plug-and-play

Your unit comes back ready to refit. Plug it back in, start up and drive — no extra setup required.

Ongoing support

Questions after the work is done? We're on hand to help, and your backup stays safe with us.

Services

Calibration work, tailored to your hardware.

Performance

Smoother power delivery, sharper throttle and real-world gains — developed for your exact engine and hardware.

Stage 1 — optimised on standard hardware
Stage 2 — for supporting modifications
Economy & drivability calibrations

Emissions solutions*

Specialist emissions solutions for motorsport, off-road and export applications.

DPF* solutions
EGR* solutions
AdBlue / SCR* solutions

* Supplied strictly for motorsport, off-road & export use only. Not legal for use on UK public roads and will cause a vehicle to fail its MOT. See full notice in the footer.

Gearbox / TCU

Transmission calibrations that complement your engine tune for crisper, more decisive shifts.

Faster, smoother shift mapping
Raised torque limiters
Matched to your engine calibration
FAQ

Questions, answered.

Most units are calibrated and dispatched within 2–3 working days of arriving with us. You'll get an estimated dispatch date as soon as we receive your unit, and live updates as it moves through each stage.

We work with a wide range of petrol and diesel ECUs and transmission control units across most popular makes. If you're not sure whether yours is supported, send us your vehicle details and we'll confirm before you post anything.

A full backup of your original calibration is taken before any work begins, and every map is developed within safe limits for your hardware, then checksum-corrected and bench-validated before it's returned. Your original data stays archived with us.

Free prepaid postage to us, a full original backup, your bespoke calibration, bench testing and validation, tracked insured return shipping, and ongoing support. Your unit comes back plug-and-play, ready to refit.

No. Emissions-related modifications (DPF, EGR and AdBlue/SCR solutions) are supplied strictly for motorsport, off-road and export use only. It is illegal to use these modifications on vehicles driven on public roads in the UK, and removal of emissions equipment will cause a vehicle to fail its MOT. It is the customer's responsibility to ensure compliance with their local laws.

Start your tune

Ready when you are.

Tell us your vehicle and what you're after. We'll confirm what we can do, then send your free prepaid postage label.

hello@howellperformance.co.uk Chichester, West Sussex · United Kingdom

We'll reply within one working day.

HOWELL PERFORMANCE

* Emissions-related modifications (DPF, EGR, AdBlue/SCR solutions) are supplied strictly for motorsport, off-road and export use only. It is illegal to use these modifications on vehicles driven on public roads in the UK. It is the customer's responsibility to ensure compliance with their local laws. Removal of emissions equipment will cause a vehicle to fail its MOT.

© 2025 Howell Performance. A sister brand of Howell Systems. Chichester, United Kingdom