Nothing in GT5 is twin-charged with mods, if any of these are in the game; technically these would be 'stock' driven.
Oh, and twin-charging is when a turbo is used with a supercharger; not turbo's.... that would be twin or sequential turbo charging.....
Wikipedia:
"Commercial availability
The concept of twincharging was successfully used by Lancia in the 1980s on the Lancia Delta S4 rally car. The idea was also successfully adapted to production road cars by Nissan, in their March Super Turbo [1]. Additionally, multiple companies have produced aftermarket twincharger kits for cars like the Subaru Impreza WRX, Mini Cooper S, Ford Mustang, Nissan Skyline GT-R, Toyota MR2, as well as the GM 3800 Engine, as in the Pontiac Bonneville SSEI, Pontiac Grand Prix GTP, and the Chevrolet Cobalt SS among others.
The Volkswagen 1.4 TSI is a 1400 cc engine – utilised by numerous automobiles of the VW Group – that sees use of both a turbocharger and a supercharger, and is available with eight power ratings:
103 kilowatts (140 PS; 138 bhp) @ 5,600 rpm; 220 newton metres (162 lbf·ft) @ 1,500-4,000 rpm — VW Golf V, VW Jetta V, VW Touran
110 kilowatts (150 PS; 148 bhp) @ 5,800 rpm; 220 newton metres (162 lbf·ft) @ 1,250-4,500 rpm — SEAT Ibiza IV
110 kilowatts (150 PS; 148 bhp) @ 5,800 rpm; 240 newton metres (177 lbf·ft) @ 1,500-4,000 rpm — (CNG version) VW Passat VI, VW Passat VII, VW Touran
110 kilowatts (150 PS; 148 bhp) @ 5,800 rpm; 240 newton metres (177 lbf·ft) @ 1,750-4,000 rpm — VW Sharan II, VW Tiguan, SEAT Alhambra
118 kilowatts (160 PS; 158 bhp) @ 5,800 rpm; 240 newton metres (177 lbf·ft) @ 1,500-4,500 rpm — VW Eos, VW Golf VI, VW Jetta VI
125 kilowatts (170 PS; 168 bhp) @ 6,000 rpm; 240 newton metres (177 lbf·ft) @ 1,500-4,500 rpm — VW Golf V, VW Jetta V, VW Touran
132 kilowatts (179 PS; 177 bhp) @ 6,200 rpm; 250 newton metres (184 lbf·ft) @ 2,000-4,500 rpm — VW Polo V, SEAT Ibiza IV, Škoda Fabia II
136 kilowatts (185 PS; 182 bhp) @ 6,200 rpm; 250 newton metres (184 lbf·ft) @ 2,000-4,500 rpm — Audi A1 "