Click above to view the supercharged Geiger H3 in our hi-res gallery

Mention the name Geiger to a physicist and you're likely to hear about the man who discovered the atomic nucleus and the meter that bears his name. To automotive tuning fanatics, the name refers to the aftermarket firm that turns lethargic HUMMERs into tarmac-chomping beasts. But we're not so sure the two are that far removed.

Geiger's latest project is another riff on the relatively (and only by comparison) "small" H3, tinkering with the truck's reactor core to pump up its radioactivity. The stock H3 comes with a 3.7-liter inline-five producing a paltry 239 horsepower and 241 little torques, though it is available with a 5.3-liter V8 which still only manage 300hp and 320 lb-ft of twist. Along comes Geiger to fit a supercharger to said eight-cylinder, boosting output to 423 megatons horsepower and 502 lb-ft of torque. So equipped, the 5000-pound Geiger'd Hummer can reach 60 miles-per-hour in an admirable 7 seconds. 380mm discs gripped by six-pot calipers bring it all back to a halt, surrounded by 22-inch wheels bearing 305/40 Continental rubber. The interior, decked out in carbon fiber, is a matter of taste, but we love how Geiger revives classic racing livery: After their custom H2 popped up in a baby-blue and orange Gulf scheme, this H3 brings back the iconic striped white Martini livery popularized by Lancias on the rally circuit and Porsches on the track. Check it out for yourself in the gallery below.

[Source: Motor Authority]

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