BMW M3 (F80) & M4 (F82)
POWER UPGRADES


Stage 1



We are able to offer two different methods for tuning the F8x M3/M4 ECU; our standard tune includes our proven calibration which lifts power to around 510 bhp, and the more recent Ecutek software delivered tunes which allow us greater tuning of the ECU and as such provide 520 bhp. We've fine-tuned the calibration for both on our in-house Dyno as well as living with the setup day to day on the road with our own development cars. Combined with our various track testing sessions, we feel we have developed the ultimate software upgrades.

The latest 2018 M4 models feature the new OPF filters in the exhaust. These dense particulate filters form a significant restriction in the exhaust so careful tuning is need to limit excess back pressure and stress on the engine.

Fortunately we are now able to tune the F8x M3/M4 ECU with the latest Ecutek software. This new software tool not only gives us access to all the critical maps and strategies within the ECU, but it also provides detailed logging capabilities to allow us to quickly analyse our changes and improvements. We pride ourselves on having the best calibrations available for the F-series engines but the introduction of the Ecutek software has lifted these to a whole new level.

With the Ecutek software we are able to combine the best of BMW calibration updates such as the recent 460bhp CS and GTS models along with our own proven tuning adjustments. All aspects of the calibration have been refined; from the adjustable pops and crackles out of the exhaust, to the recalibrated power dials on the centre screen. We have spent considerable time refining the throttle maps and power delivery in each gear to ensure quick but controllable progress. The power is instantly adjustable with the BMW Drive selection modes so you can quickly tailor the delivery to the environmental conditions.

Even the cars equipped with the new OPF filters and standard exhaust in place are able to release a massive 80bhp extra from our standard tune, with power increasing to around 510bhp, and 90bhp extra with the Ecutek developed tune. Both have over 500lbft available from low in the rev range to provide huge increases.

Each car that comes in will also have the engine management system checked and updated to the latest BMW software version.

Litchfield Workshop Tuning Options

Stage 1 510 bhp ECU tuning

£500.00 ex VAT

£600.00 inc VAT


Stage 1 520 bhp ECU tuning with Ecutek software license

£600.00 ex VAT

£720.00 inc VAT


Dyno Tuning

£120.00 ex VAT

£144.00 inc VAT


Remote Tuning Option

Stage 1 ECU tuning with Ecutek software, Bluetooth interface and programming key

£825.00 ex VAT

£990.00 inc VAT


S55 Engine Crank Hub Upgrade



For further upgrading above our Stage 1 upgrade we would recommend fitting our S55 crank hub fix as there have been multiple instances of higher powered cars having the engine timing slip, which puts the car into a limp mode and ultimately stops it from starting.

We offer a couple of options to resolve the problem which we have successfully been applying for a number of years for both customers and other garages that have experienced this issue.

The most straight forward and cost effective solution is to install our Bolt Capture. This CNC and anodised upgraded was developed in-house and stops the crankshaft bolt from loosening over time or under high load. The upgrade only requires 4 hours to install and can be fitted in conjunction with a performance upgrade on the same day.

For more information on this known problem and our options for fixing it, please read our blog post about the issue.


Litchfield Bolt Catcher Crank Hub upgrade

£388.00 ex VAT

£465.60 inc VAT

M4 dyno 1
M4 dyno 2


Stage 2 540 BHP Tuning with Sports Exhaust



Our Stage 2 upgrade uses a performance CAT back exhaust system to allow the engine to breathe more easily and comes with our Ecutek delivered Stage 2 ECU calibration to increase power and noise.

We offer a choice of exhaust options to suit each customer’s noise requirements and budget. All are European made provide similar performance improvements when combined with our ECU calibration. By retaining the original BMW Catalytic convertor in the turbo down pipes the cars retain their emissions and MOT compliance.

Derbyshire based Milltek Sport have been one of our oldest suppliers and offer superbly engineered solutions for a variety of our performance cars. The Milltek option is produced in full stainless steel system that not only flows better than the standard exhaust but also sound significantly better. The system uses Milltek’s existing and well-proven EC approved cat back technology, but with the added functionality of the latest valve technology, utilising OE spec BMW electronic valves in its construction – still controlled via the factory command systems.



Stage 2 with Milltek Catback Exhaust with Polished Trims

£2,557.66 ex VAT

£3,069.19 inc VAT


Milltek Catback Exhaust (supply only)

£1,556.13 ex VAT

£1,867.36 inc VAT


Optional tail trim finishes

Cerakote Black trim

Titanium trim

£126.56 ex VAT

£345.57 ex VAT








The Remus cat-back exhaust system is also available for the BMW M3 and M4. The Remus system features a carefully designed x-pipe which removes the front silencer along with the secondary cats. The rear silencer includes 2 integrated valves which are controlled by the original servo motors.


M4 Remus exhaust 1
M4 Remus exhaust 2
M4 Remus exhaust 3
M4 Remus exhaust 4
M4 Remus exhaust 5
M4 Remus exhaust 6
M4 Remus exhaust 7
M4 Remus exhaust 8
M4 Remus exhaust 9




The system features a shot-blasted finish along with a choice of four different tail pipes designs.

The price below includes the Racing X-pipe, rear silencer (with stainless trims), fitment and an ECU remap to suit.

Stage 2 with Remus Catback Exhaust

£3,191.08 ex VAT

£3,829.30 inc VAT


Remus Wolf Inside with Racing X-pipe (supplied only)

£2,441.08 ex VAT

£2,929.30 inc VAT






Akrapovic logo

Akrapovic Evolution Line


Our preferred choice for the BMW M3 / M4 is the gorgeous titanium Akrapovic Evolution exhaust system. This is the system we have installed on our own M4 demonstrator. As well as delivering power gains throughout the rev range, the Evolution system also greatly improves the M3/M4's appearance and sound. A healthy weight loss of around 7 kg over standard helps along with significantly improved exhaust gas flow. The exhaust uses original valve motor system so does not need extra wiring.

M4 Akrapovic evo 1
M4 Akrapovic evo 2
M4 Akrapovic evo 3
M4 Akrapovic evo 4
M4 Akrapovic evo 5
M4 Akrapovic evo 6



The price includes the slip-on system, evolution pipes, tail trims, fitting and ECU remap.


Stage 2 with Akrapovic Evolution Exhaust

£5,711.97 ex VAT

£6,854.36 inc VAT


Akrapovic Evolution Exhaust (supplied only)

£4,961.97 ex VAT

£5,954.36 inc VAT




Stage 3 - M3/M4 Akrapovic Downpipes - 560 bhp



M4 Akrapovic Downpipe

Stage 3 unleashes the full potential of the BMW M3 / M4 turbos and increases power to a reliable 560 bhp and 530 lbft. Stage 3 is designed for off road use only and uses the full de-CAT down pipes to give the maximum back pressure reduction for increased power and response. The Akrapovic downpipes feature a cast V-band collector and welded heat shielding for improved flow, reliability and heat retention.


For use with any of the exhausts we offer, Akrapovic downpipe (stainless steel) and a full ECU recalibration will give significant gains and also benefits from a 3 kg weight reduction.


Stage 3 upgrade using Akrapovic Downpipes with exhaust option:


Stage 3 with Akrapovic Downpipes and Milltek Exhaust with Polished Trims

£3,877.68 ex VAT

£4,653.22 inc VAT


Stage 3 with Akrapovic Downpipes and Remus Exhaust with Stainless Trims

£4,489.24 ex VAT

£5,387.09 inc VAT


Stage 3 with Akrapovic Downpipes and Akrapovic exhaust

£7,031.99 ex VAT

£8,438.99 inc VAT




Customers looking for more noise and improved performance can also just opt for the Akrapovic downpipes with the original exhaust system. Whilst power levels will drop to around 540 bhp with our Stage 3 remap this represents a very cost effective way to improve both noise and performance.


The price below is for the downpipe (not including a catback exhaust), fitted (based on 4 hours) with ECU mapping to suit. Please note that this removes all catalytic convertors from your car and should therefore be used for ‘off road’ use only.


Stage 3 with Akrapovic Downpipes without exhaust system

£1,973.02 ex VAT

£2,367.62 inc VAT


Akrapovic downpipes (supply only)

£1,073.02 ex VAT

£1,287.62 inc VAT