Illinois-based Roadster Shop worked on keeping the exterior as conservative as possible.
AutotopiaLA presenter Shawn has visited Illinois and met with Jeremy Gerber to check out a one-of-a-kindGrand National. Gerber's Roadster Shop understood the turbo V6 was a staple for the Regal Grand National, but it knew an LS swap just had to be done.
Under the hood was a twin-turbocharged V8 LS7 engine worked on by Wagner Motorsport, which, on the dyno, claimed to make as much as 1,600 horsepower. The 427 was connected to a Bowler 4L80E transmission with a manual valve body and a nine-inch rear axle.
Handling all that monstrous power was the shop's very own Fast Track IRS chassis, mounted with 18" x 19" custom wheels in 295/35R18 Michelin Pilot Sport tires for the front and 345/30R19 Nitto NT555 tires for the rear. Parts like Fox coil-shock absorbers and Baer six-piston brake calipers were also on the equipment list.
The power unit may be out of character, but the design stayed true to purists' delight. Although, the shop added a few tweaks to its likings, including front lower spoilers, slightly wider wheel flares, and a slightly larger 3D-printed spoiler.
Inside, the layout still looked familiar except for the roll cage. However, the entire dash was reworked by hand, while the door panels had 3D-printed components. Even the Recaro seats were modified to look as stock as possible.
What wasn't stock was the center console and gauge cluster. The former got a lightning rod shifter system and featured a retro-styled digital display. A center stack screen was also installed, capable of controlling every car function, such as the A/C system, launch control, and traction control.
This Grand National can run two ways - mildly with a 1,100-hp tune or aggressively with the aforementioned 1,600-hp tune. The presenter was delighted to give it a whirl as it joined the 2,000-hp twin-turbo Chevrolet Bubble Top Impala as the cars he drove with at least 1,500 horses.