Locked out at 11pm near Heathrow. They were with me in 25 minutes, no damage, cheaper than the dealer quoted. Genuine lifesavers.
James M.
Hounslow · Emergency Unlock
N57 · B57 · E90 · F30 · G20 · 335d · 340d · 535d ///
Stage 1 BMW 335d Remap. From £349.
Custom Stage 1 335d / 340d / 535d tune. 313 → 400 bhp, 465 → 620 ft-lb on stock turbos. Mobile across West London.
30-min response
West London
Fully insured
Public & PI
Non-destructive
Industry standard
Dealer-level kit
AutoTuner · Autel
Fixed quotes
Before we attend
Instant Tailored Quote
Get An Instant Remap & Package Quote
Enter your reg & postcode. Tick any extras — we'll send a tailored quote via WhatsApp in minutes.
Choose your tuning service
Add related services to your quote
0/600
Custom-written maps · Lifetime software warranty · Dyno-verified figures
No spam · No obligation · Fixed pricing confirmed before we attend
Professional. Mobile. Trusted.
The 335d's N57 tri-turbo and B57 quad-turbo straight-six are two of the most tuneable diesels ever built. Stage 1 unlocks 380-430 bhp on stock hardware with brutal 600+ ft-lb torque. We pair every 335d / 340d file with optional ZF 8HP torque-safe TCU mapping. Mobile across West London, Slough, Heathrow, Reading, Watford.
- E90 / E91 / E92 335d N57 — 286 → 360 bhp
- F30 / F31 335d N57 — 313 → 400 bhp
- G20 / G21 340d xDrive B57 — 340 → 425 bhp
- F10 / G30 535d N57/B57 — 313/400 bhp
- Torque: 465 → 620 ft-lb
- Optional ZF 8HP TCU torque-safe file
- Before/after datalogging
- 12-month software warranty
- Free revert before dealer visits
- Mobile · same day
Payment Assist · Official Partner
Spread the Cost with Payment Assist
On selected services over £250, you can split the total into 3 or 4 monthly payments with 0% APR available. A small deposit is paid on the day, then the remaining balance is collected in equal monthly instalments. No long forms, no waiting — applied on site before work begins.
- 0% APR available on selected services
- 3 or 4 equal monthly payments
- Deposit paid on the day
- Soft credit check — no impact at quote stage
- Decision in minutes, on site
- Available on jobs over £250
Finance subject to status and approval and provided by Payment Assist Ltd, authorised and regulated by the Financial Conduct Authority. 0% APR available on selected services. Terms, eligibility and final monthly figure confirmed at application. StageMyCar UK is an introducer appointed representative — we do not charge a fee for this service.
Example · Illustrative
£480 ECU Remap · 0% APR
3 payments
£120/mo
£120 deposit
4 payments
£96/mo
£96 deposit
Authorised & regulated by the FCA
Decision in minutes — apply on site
Subject to status & approval
Indicative example only. Final terms confirmed at application.
Frequently Asked Questions
How much is a Stage 1 335d remap?+
£349 mobile. Includes custom file, before/after logging and 12-month warranty.
Gains on N57 335d (E90/F30 313 bhp)?+
313 → 380-400 bhp, 465 → 590-620 ft-lb. Brutal mid-range with no hardware changes.
Gains on B57 340d xDrive (G20)?+
340 → 410-430 bhp, 516 → 620-650 ft-lb mild-hybrid system intact.
Is it safe on the gearbox?+
Yes — we cap peak torque to ZF 8HP rating and pair with a torque-safe TCU file on request (+£199).
Insurance & warranty?+
Declare to insurer (typically +£60-£120). 12-month software warranty, free revert before dealer visits.
★ 5.0 / 5 · 36 Google reviews
Trusted by drivers across West London
Related Services
StageMyCar UK is a mobile auto locksmith and ECU specialist serving West London, the M4 corridor, Heathrow, Slough, Reading and surrounding areas. Fixed-price quotes, DBS-checked engineers, fully insured, 7 days a week. Call 07312 826380 for an instant quote.