Ah, the SEAT Leon Cupra ST – one of Volkswagen Group's hidden gems. Sharing its underpinnings with the VW Golf and the Audi A3, this hot hatch is already a beast of a machine right out of the factory, with its most powerful iteration producing 296 brake horsepower and 258 pound-feet of torque. In contrast, the Honda Civic Type R is rated in the nearby neighbourhood at 306 bhp and 295 lb-ft torque.

While with the Leon Cupra ST could very well match up with the Japanese hot hatch with its current power output, Siemoneit Racing has something else in mind and gave the Spanish compact hatchback a solid overhaul.

Gallery: Siemoneit Racing Seat Cupra 300ST 4Drive

Siemoneit Racing is an all brand German tuner that's lead by Stefan Siemoneit. His team not only upgraded the SEAT Leon Cupra ST engine but also the chassis, wheels, and a handful of aesthetic parts. The result? A 514-bhp rocket hatch that could go reach 62 miles per hour in just 3.4 seconds from a complete standstill.

To achieve the feat, Siemoneit Racing installed in-house parts onto the engine, which included bigger turbochargers, a high-flow air intake system, and new intercoolers with an optimised air guidance system. Turbo outlet and the pressure pipes were replaced as well to match the initial work done. More powerful fuel pumps and a fully-milled aluminium oil sump with two extra litres of capacity are also included, as well as an enhanced seven-disc clutch. After hardware and software tuning, the resulting output figures are 514 bhp at 6,500 RPM and 457 lb-ft torque as early as 3,600 RPM.

To match the new performance figures, Siemoneit Racing installed Michelin Sport Pilot Cup 2 tyres onto its in-house high-performance 19-inch forged wheels. Furthermore, a V3+ threaded chassis from KW Suspensions and 370mm ceramic brake units from the Audi RS3 have been added to take care of the rest.

See all the specs and pricing of the tuned parts in the Press Release section below.


Hide press release Show press release

Key facts: Prices*:

Vehicle: Siemoneit Racing Seat Cupra 300

Series: Seat Cupra 300ST 4 drive, model year 2018


Wheels: Siemoneit Racing “Vader” - Monoblock forged wheels

Front/rear 8.0 x 19 ET 45 per wheel     319,00 €


Tyres: Michelin Sport Pilot Cup 2

Front/rear 235/35 ZR19


Power increase: 521 PS / 383 kW at 6500 rpm

620 Nm at 3600 rpm 

Including mounting (TÜV Approval 450 PS) from 14.900,00 €

Including mounting ( Export Version 521 PS) from 23.800,00 €


consisting of: 580 turbocharger, turbo inlet, pressure pipe kit, turbo outlet, premium intercooler with air guidance system, high-flow air intake system, EWG downpipe exhaust system “RipJaw” with valve control and EWG approval, end-pipes. High pressure pump upgrade, enhanced in-tank fuel pump, full aluminium oil sump with 2 litres extra oil volume, 7 disc sports clutch, electronic motor alignment, electronic DSG alignment.


Performance: 0-100 km/h 3.4 S

100-200 km/h 6.8 S

280 km/h (electronically limited)


Chassis: V3+ KW Suspensions thread chassis

*All prices including 19% German VAT