After acquiring Qvale of Italy, MG Rover allocated the project code X80, and set up a subsidiary company, MG X80 Ltd., to produce a new model based on the Qvale Mangusta. One attraction was the potential sales in the United States, as the Mangusta had already been homologated for the market in the United States.
The MG X80 was originally revealed as a concept car in 2001. However, the styling was considered too sedate. When the production model, now renamed MG XPower SV, was eventually launched the following year, designer Peter Stevens had made the car's styling more aggressive.
The conversion from a clay model to a production car, including all requirements, was done in just three hundred days by the Swedish company Caran. One goal was to get a street price of under £100,000. The car's baseline model eventually cost £65,000, with the uprated XPower SV-R model costing £83,000.
The production process was complex, partly caused by the use of carbon fibre to make the body panels. The basic body parts were made in the United Kingdom by SP Systems, and then shipped to Belco Avia near Turin for assembly into body panels.
These were then assembled into a complete body shell and fitted onto the box frame chassis and running gear and shipped to the MG Rover Longbridge factory to be trimmed and finished. Several of the cars' exterior and interior parts were sourced from current and past models of Fiat. The headlights, for example, were taken from a Punto Mk.2, and the rear lights from a Fiat Coupe.
According to the data at the MG XPower SV Club, approximately 82 cars were produced excluding the four 'XP' pre production prototypes.
This included a few pre production and show cars which were later dismantled, before production was stopped due to lack of sales. Most were sold to private owners, with the final ones being sold to customers in the beginning of 2008. most were sold in Europe and Asia, with only one model sold in America, a supercharged XP model.
The base MG XPower SV was powered by a 4.6 L FordModular V8 which produced 320 bhp (239 kW; 324 PS) at 6000 rpm and 410 N⋅m (302 lbf⋅ft) of torque at 4750 rpm. The SV's advanced carbon fibre body meant it had a top speed of 165 mph (266 km/h) and a 0 to 60 mph (97 km/h) time of 5.3 seconds. Club Sport options, for customers who wished to use their SV on the track, were planned but never produced.
The XPower SV-R, released the following year, featured a Roush tuned, "cammer" 5.0 L 32 valve Modular V8. MG claimed the SV-R produced 385 bhp (287 kW; 390 PS), however some sources claim this figure is actually closer to 410 bhp (306 kW; 416 PS). Its top speed was estimated to be around 175 mph (282 km/h) and its 0 to 60 mph (97 km/h) time to be close to 4.9 seconds.
Unlike the base SV model, the SV-R was offered with a choice of either manual or automatic transmissions, as well as a factory approved nitrous oxide kit from the MG ZT-T Bonneville world record car, which pushed the power output to an estimated 1,000 bhp (700 kW).
In April 2008, MG Sports and Racing Europe, based in Eardiston, near Tenbury Wells in Worcestershire, announced the relaunch of the XPower SV under the name MG XPower WR. Priced at between £75,000 and £90,000, the new model had a supercharged engine rated at 540 bhp (403 kW; 547 PS), and seven cars were said to have already been sold.
Riley's use of the "MG" trademark resulted in a legal dispute with Nanjing Automobile (Group) Corporation, which had also acquired assets of the defunct MG Rover Group. This case was won by Nanjing in February 2010.
In December 2009, it was reported in the press that no new cars had been manufactured by MG Sports and Racing Europe since its founding, and that employment tribunal proceedings had been initiated by two employees for non payment of wages. Riley was also arrested by police in December 2009, on suspicion of theft of an XPower WR car previously sold to a Canadian businessman, who had been working on behalf of the company.
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