The Rapier 6 (also known as the Rapier SR2) was a sports prototype racing car built by LM3000 in 1999. It used a 3-litre Nissan V6 engine, and Team Sovereign ran the car in the FIA Sportscar Championship (then known as the Sports Racing World Cup). The car achieved moderate success, and Team Sovereign retired it at the end of the 2003 season, after the series folded. In 2011, it reappeared in the Britcar series, being driven by Mike Millard.

In 1999, LM3000 built a car for the SRL category of the Sports Racing World Cup (SRWC), the Rapier 6, and this was run by Sovereign Racing. Although it was entered in the 2 Hours 30 Minutes of Spa, an event held in May 2000, it would not be until August, at the 2 Hours 30 Minutes of Donington Park, that the Rapier 6 made its debut in the hands of Mike Millard and Ian Flux. The pair completed 62 laps before suspension issues forced them to retire. Flux and Millard next drove the car at the penultimate round of the SRWC, which was the 2 Hours 30 Minutes of Magny-Cours, but retired again, this time due to a driveshaft failure after 57 laps.

Sovereign Racing, now renamed Team Sovereign, remained in the series for 2001, which had now been renamed the FIA Sportscar Championship. Millard and Flux ran the Rapier 6 in the first event of the season, which was the 2 Hours 30 Minutes of Catalunya, and took ninth overall, which equated to fifth in the SR2 category. Engine failure prior to the start of the 2 Hours 30 Minutes of Spa prevented them from competing in that race, and this was followed by a retirement from the 2 Hours 30 Minutes of Magny-Cours due to suspension failure after 50 laps. At the 2 Hours 30 Minutes of Donington, Millard and Flux were able to finish tenth overall, and third in class. The pair finished tenth again at the next event, which was the 2 Hours 30 Minutes of Nürburgring; this time, it equated to seventh in class. Team Sovereign finished eighth in the SR2 Team's Championship, whilst Flux and Millard shared 18th in the SR2 Driver's Championship.

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