2003 PORSCHE 911

2003 Porsche 911 996 GT3 Manthey M440 LF53 GVP

A walk round and a review of the car can be seen in the youtube video if you search for; @Prepworks_2023

First Registered on the 21/11/2003, this 2003 Porsche 911 GT3 has had only 3 owners in the last 23 years.

It was purchased from Porsche Centre Park Lane, London, with a retail on the road price of £82,113.36 pence. The original bill of sale and option list can be found in the vehicle’s history.

The first owner kept the vehicle right through to 2023, where it was purchased, off market, buy its second owner. 1.5 years later, it was purchased in May 2025 by the current owner, again an off market sale. This car has never been offered for sale on the open market.

The current owner purchased the car after owning a 996.1 GT3 for over 5 years, but with an option to buy such a low owner and special version, he sold the 996.1 and made the upgrade to this car.

The car was optioned with what some consider to be the ultimate must have for these GT3 models, with the Clubsport options ticked (all Clubsport items still present, full rollcage, harnesses, Perlon covered bucket Seats, electrical cut-off and Werner fire extinguisher), Litronic Headlights, PCCB brakes (now replaced with Steel rotors), Black Extended Leather interior and Basalt Black Metallic paint. The car has a full complement of original books, including the sought after Price List and GT3 owners manuals that often go missing, and also has 2 keys.

Through-out its life this car has been used as intended, covering 86k miles at present. The vehicle has also seen extensive maintenance, with record file spanning back to its first registration and covering every bit of maintenance the car has received. The folder is approaching 4” thick and tallies more than £100k in cost. The original service book has been filled, and a new (original Porsche) book has been started to continue the records. Its first recorded maintenance was through the Porsche network at the main dealers in Reading and Hatfield, before moving to being looked after at PARR. There, the car was looked after, and stored (at times), up until 2022. With a change of owner, the maintenance swapped to Zeigen Porsche in North Yorkshire, before the latest change of owner, where the maintenance was then picked up by Prepworks.

The history folder shows an even more detailed picture with additional work & maintenance being carried out at Manthey and JZM.

Although this car presents as a very original car, it has been subject to some modifications, not least of which, is the fitment of the M440 powerkit by Manthey. This was fitted in Autum/Winter of 2011 at approx. 52k. This powerkit included the rebuild of the engine with larger pistons and suitable cylinders, and a remap of the factory ECU. In the spares with the car, are the original cylinder liners and pistons/rings. The car was measured on the VGS dyno (tuner used by Manthey) prior to the rebuild and then post the rebuild. The car already had an M&M exhaust system installed prior to the rebuild, this exhaust was developed with Manthey for the K400/K410 power kits as fitted to the standard 3.6l versions of the engine in period. With the rise in capacity, the remap, exhaust and a subsequent modification to the airbox, the car made 457 PS at VGS (450 bhp), this is up from the factory figure of 381bhp, a 69bhp gain. The most notable change is the increase in torque, now at 460Nm, up from the original claimed 385Nm from the factory. This gives the car the ability to pull from 30mph in 6th gear.

Under the current owner a vehicle refresh has been carried out, covering many areas and aiming to bring the car to condition that makes it useable for many years to come. The current owns and runs a Porsche specialist, specalising in the maintenance in 996/997 GT3 models. This car has been used to showcase some of the companies products, processes and maintenance work. In 2025 the car received a set of Prepworks specification Nitron dampers, these are designed as an match to the OE 996 GT3 overing, with the spring rates matched to the OE supplied, but with the option of adjustable damping, the adjusters are visible in the rear and front and attached to the rollcage or come through he front strut covers. At the same time, a complete Numeric shifter setup was fitted, giving a more precise shift with a self centreing feature, along with the Numeric cables, this transforms the standard cars loose shift into a precise action. An RS replica bare carbon rear wing element has been fitted, along with some 4deg wing risors. These match with the Cup car front splitter.

Around the same time, the vehicle was sent to a local detailer, KS Autocare, where a single stage machine polish was carried out and a 5 year ceramic coating was applied to the vehicle in a 3 day deep clean package.

Following this work, a Dry Ice clean was carried out on the underside of the car, along with the application of a Dinatrol clear wax protection.

In early 2026 the car was subject to an engine out service. This included a complete refresh of the coolant system, with new coolant fittings being welded into the engines castings where they are prone to failure, all new rubber coolant hoses above the engine, new front side radiators, new header tank, new water pump and replacement coolant. Whilst the engine was out of the car, the brake calipers were sent to Brake Caliper Refurbs for a complete factory refresh and all new seals, the brake discs were replaced with Girodisc all around, new Pagid RSL29 pads where fitted all around and HEL braided hoses where fitted. The brakes were bled with Motul RBF660 brake fluid. Whilst the engine was out, a major service was carried out, with plugs, coil packs and aux belt all being changed. The clutch slave cylinder was changed, along with the rear sections of clutch line and the clutch bled.

Since the completion of this work, the car has covered only 200miles.

Since purchasing the vehicle in May 2025, the current owner has spent over £24,000 on maintenance, updates and preservation works to keep the car in the condition it is presented in.

The car on the face of it, looks like a very modified car, but it has been optimized in away that takes the 996 GT3 and bridges the gap to the performance of the later cars. It drives as an original car would, but has a bit extra in most areas. It’s a visceral driving experience that is very analogue, the removal of the stereo means you get to listen to one of the best NA flat 6 soundtracks through the M&M exhaust system and the additional induction noise from the tweaked airbox. The changes hence the experience of the car, making it more capable and adjustable between being a road or track car, as intended by Porsche.

Below is a rundown on the vehicle specification, and following this, a list of the vehicles notable service:

Exterior

Genuine Cup Car front bumper with centre radiator modified to angle the airflow up through the top vents (no lower vents in Cup bumper).

Genuine Cup Car spring loaded tow hook.

Genuine Cup car splitter.

Cup car airflow mods to inner arch linings at the front and front airdams.

Carbon RS replica rear wing (original wing supplied with car) with 4deg wedges.

Genuine RS engine cover air scoop.

Interior

Factory Clubsport spec with full rollcage, Perlon seats, Schroth harneses (updated to later models), Werner fire extinguisher and mounts (not installed, but supplied with car).

OMP Steering wheel on Momo Boss (original wheel supplied with car).

Head unit removed and OE cubby fitted (head unit supplied with car).

Factory red seat belts.

RS style door pulls.

Engine

Manthey 3.9ltr M440 Engine conversion completed approx. 35k ago. 450bhp and 460Nm of torque.

M&M complete exhaust system including manifolds, 200cel X pipe cats and side silencers, fitted with all new clamps and gaskets in 2026.

Modified factory airbox by VGS/Manthey for greater airflow.

Genuine Porsche 964 RS engine mounts.

Transmission

Rebuilt at Manthey in 2016 @ 67k

RS Single Mass Flywheel

Motorsport Spec Diff

Genuine 997 GT3 front gearbox mount

Suspension

Prepworks Specification Nitron Roadsports with adjustable damping (original dampers and springs included).

Nitron drop links.

RSS front castor pucks.

OE rubber bushes in all arms.

Brakes

PCCB Calipers rebuilt in 2026 with all new seals and bleed nipples.

HEL braided stainless steel brake lines.

Girodisc 2 piece brake discs fitted front and rear.

Pagid RSL29 Brake Pads fitted front and rear.

Wheels

Original 8.5” and 11” GT3 wheels and center caps, wheels refurbished in July 2026.

Michelin Pilot Sport PS4S tyres, 245/35 front and 295/30 rear. All dated 2024.

Wheel stud conversion.

Maintenance Records

• 20/05/2004 11484 miles. Minor Service. Porsche Centre Reading.

• 04/05/2006 21619 miles. Major Service. Porsche Centre Reading.

• 03/06/2008 36895 miles. Minor Service. Porsche Centre Hatfield.

• 20/03/2009 42836 miles. Oil & Filter, Brake fluid change. PARR.

• 03/08/2009 45998 miles. Spark plug, coil pack, fuel filter, brake fluid, oil & filter, New brake reservoir. PARR

• 14/01/2010 45998 miles. Major Service, New AC Condensors, Rear pads, New Suspension parts, alignment. PARR.

• 15/01/2010. New windscreen. PARR.

• 15/06/2010. Repair oil leak, new RMS, New Oil Tank, Engine & Gearbox removed, Geo re-set. Oil & Filter. New Porsche Battery. PARR

• 13/08/2010 49947 miles. Oil & Filter, brake fluid changed to Castrol SRF. PARR

• 07/10/2010 51611 miles. Repair coolant leak. PARR

• 21/01/2011 52942 miles. Oil & Filter. JRZ Damper Refurb. Geo. PF discs and pads. PARR

• 11/03/2011 52942 miles. Minor service, gearbox oil change. PARR.

• 07/06/2011 54532 miles. Dampers back to JRZ. PARR

• 09/02/2012 57515 miles.New Motorsport Diff, gearbox oil change, Geo re-set, Oil & filter. PARR.

• 02/08/2012 58934 miles. General check over. PARR.

• 15/07/2013 62270 miles. Brake fluid change, gearbox oil change, damper set up, New Splitter. PARR.

• 13/06/2014 64228 miles. New starter motor, new rear wheel bearings, new rear wheel hubs. PARR.

• 03/07/2014 63322 miles. Gearbox rebuild, new clutch, new 3rd gear. Oil & filter. Brake Fluid. Manthey Racing.

• 28/08/2014. Geo setup. New Battery. PARR

• 05/09/2014 65016 miles. General Check over. PARR

• 21/07/2015 66161 miles. Oil change, water hose repairs. Manthey Racing.

• 23/07/2015 66185 miles. Brake Fluid Change. Manthey Racing.

• 08/09/2015 66862 miles. General check over, storage charges. PARR.

• 04/05/2016 67306 miles. Gearbox rebuilt to remedy 2014 faults, new 3rd/4th/5th/6th gears. Manthey Racing.

• 13/06/2016 67306 miles. Battery Change. Manthey Racing.

• 31/03/2017 69760 miles. Minor service, brake fluid, dampers re-gassed and Geo re-set. PARR.

• 19/05/2017 72964 miles. General check over. Modified wheel arches to cup car spec. PARR.

• 14/07/2017. New clutch release bearing. Manthey Racing.

• 30/08/2017 73921 miles. Storage. PARR.

• 11/09/2017 74345 miles. Front discs & pads. New splitter. Bleed clutch. PARR.

• 03/05/2018 74695 miles. Front discs & Pads. Cylinder leak down. Brake fluid. Storage. PARR.

• 31/07/2018 74695 miles. Spark plug service. PARR.

• 24/09/2019 74695 miles. Investigate running fault. New air mass meter, new crank sensor, new fuel pump. PARR.

• 12/02/2019 75890 miles. Rebuild dampers, geo and setup. PARR.

• 10/06/2019 76912 miles. Geo setup, corrosion tidy up. PARR.

• 29/07/2019 77257 miles. AC system rebuild and re-gas. PARR.

• 23/08/2019 79825 miles. Remove cage and fit new protection foam. PARR.

• 08/11/2019 79825 miles. Oil & filter, gearbox oil, air filter. PARR.

• 24/02/2020 80130 miles. Storage. RMS leaking, split engine and gearbox, clutch contaminated, new clutch & fork and RMS. Replace over engine coolant pipes. New power steering rack. PARR.

• 11/03/2020. Paintwork tidy up. PARR.

• 31/07/2020 80130 miles. Oil and coolant change. Brake fluid change. PARR.

• 05/01/2021 80193 miles. Storage at Spa.

• 02/03/2021 80193 miles. Oil & filter. PARR.

• 25/05/2021 80221 miles. ABS Fault. ABS pump replaced. PARR.

• 21/09/2021. Brake fluid. PARR.

• 21/03/2022 80253 miles. General check over. Replace suspension parts. Storage. PARR.

• 31/10/2022 80309 miles. New spark plugs, new coil packs. PARR.

• 03/11/2022 81138 miles. Door mirror defective. New door mirror motor. New oil level sensor. PARR.

• 23/04/2024 82111 miles. Minor Service. Zeigen Porsche.

• 06/03/2025 83865 miles. Minor Service. Zeigen Porsche.

• 01/05/2026 86679 miles. Major service. Spark plugs, coil packs, aux belt, coolant, fuel filter, radiators, coolant lines, oil pressure switch, brake caliper refurb, Girodiscs, Pagid RSL29 pads. Prepworks.