Abt Sportsline TT-R Dual Fuel
Abt Sportsline came to the Essen Motor Show with a dual-fuel TT-R that produces 355 bhp running on gas or LPG. It also shows that the tuning world is exploring ways to attain high speeds with less negative environmental impact. The supercharger produces almost 100 more hp, good for 60 mph in five seconds dead-almost a second faster than the standard model. A carbon fiber hood, aggressive aero kit and Abt's oversized wheels complete the visuals. It could be a supercar slayer. A clean one at that.

Based on the track-focused GT3 and inspired by the legendary 1973 911 Carrera RS, the RGT comes with a racer's look, sporting bolt-on wheelarches, an integral roll cage, and pin-sharp handling. Weight-saving measures include removing the rear seats and fitting aluminum doors that strip another 30 pounds. Then RUF went to work on the 3.8-liter engine, producing 445 bhp with the aid of titanium and high compression. The car hits 60 mph in 4.2 seconds, 125 mph in 13.5 seconds and a top speed of 197 mph. It's an expensive option at more than $230,000, but it is a RUF.

Hartge Z30 Biturbo
The BMW Z4 M Coupe is an instant classic, but it could be faster. That's where Hartge steps in with its twin-turbo Z30 Biturbo. Now this monster pumps out 380 bhp and 330 lb-ft of torque. It also sports a new suspension, an advanced limited-slip differential (that should help even average drivers slide everywhere on armfuls of opposite lock), and a body kit that adds more muscle. It weighs less than the M Coupe, at 3069 pounds, hits 60 mph in 4.8 seconds and will rocket close to 180 mph.

Brabus T13
As well as the CLS-based Rocket that breached 228 mph at Nardo, Brabus brought its T13 tuning kit fitted to an S600. This system includes new turbochargers, a more efficient intercooling system and low back-pressure catalytic converters, as well as reprogrammed engine electronics. Output climbs from 517 to 630 bhp, with torque jumping from 612 to 738 lb-ft. This car hit 203 mph at Nardo and 60 mph in less than 4.3 seconds-right behind the Rocket, and fast enough for an executive barge.

Mansory Continental GT
The workers at Crewe might not be too pleased to see what Mansory has done to their Continental GT. This Widebody version comes in black and orange, and the garish color scheme is continued inside with luminous orange Alcantara trim. Extended wheelarches, a plunging front end, rear wing, and twin-spoke wheels provide all the menace required and more. Under the hood, Mansory has pulled 650 bhp from the six-liter W12 and knocked half a second off the standard model's zero-to-60-mph time. It now clocks 4.5 seconds and tops out at 202 mph, not bad for a car that weighs more than 5060 pounds.

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