A run through the gears happens so fast you don't have time to soak it all in. The violent transfer of torque pins the back of your head to the headrest, and by the time you've mustered the strength to move your head forward and glance at the tach, it's time to shift again. Everything else is a blur, so you look as far down the road as your eyes can see, for it's the only piece of terra firma that remains in focus. In that tiny spot on the horizon, you're transported to the fourth dimension with such speed, you can see your next life.

Six hundred and seven horsepower means there's never enough road. In fact, you rarely get the chance to use sixth gear. Roads that were once long sweepers requiring barely a nudge on the steering wheel become corners with turn-in points, apexes to hit and a wheel to unwind. Flying through these sweepers hard on the gas, the front end starts to wash out due to the weight transfer of the squatting rear end. The steering gets lighter, and the tires turn down the volume on your conversation. But, as much as you want to stay on it, you lift just enough to get the front tires to start biting again.

It's not how fast Autothority's Stage 3 993 Turbo reaches triple digits that impresses (0 to 60 in 3.21 sec., 0 to 100 in 7.11, quarter mile in 10.54 at 136.52 mph), it's how hard it charges once it's there. Where most cars start to struggle, this straight-seeking missile is just beginning to show its strength. The needle flies by 110, 120 and 130 as if it were unleashed from a high-tension spring. Passed cars seem to be sitting still or going in reverse. On short straights, we saw 140 mph with the only things keeping us from more being a lack of road and the fear of jail time.

Autothority's Stage 3 993 Turbo may be the only car large enough to match Donald Trump's ego. To wring out 607 bhp, Autothority replaces the stock compressor wheels with larger units so they keep flowing where the stock units start to drop. The ECU is reprogrammed for boost control, ignition timing and fuel injection metering. A GReddy fuzzy logic boost controller then allows the driver to add as much as 1.2 bar. To flow enough fuel, Autothority uses a fuel pressure regulator from a 993 GT-2. A high-input mass flow sensor, wastegate actuators that hold boost longer and blow-off valves are also part of the Stage 3 package.

Special cams are integral to this process, while the Stage 1 and 2 kits use stock cams. The numbers on the cams are similar to the GT-2s. The stock intercooler is replaced by a unit twice the thickness and twice as efficient. Exhaust is improved via high-flow cats and a stainless steel exhaust system. The sound is throatier, angrier and battles the flat six's frenetic heartbeat for your ear's attention.

Blip the pedal, and the revs spike and drop quickly due to the lightened flywheel. The clutch, from the GT-2, engages quickly and asks for light feathering of the gas. From idle, the engine pulls with as much vigor as an unmodified twin turbo. Driveability has not been lost. Boost comes on at the same revs as stock-2800 for the first turbo and 4000 for the second-only with a much bigger wallop. The interior is filled with the "whoosh" of spinning turbos, and a lift of the throttle causes the "hiss" of bleeding wastegates. It's chicken soup for the soul of a madman, and it's incredibly addictive. This Stage 3 kit should also come with a 12-step program for those who get drunk on the thrill of warp drive. A false identity wouldn't hurt, either. And for passengers, adult undergarments and mild sedatives are recommended.

To apply the extra power, Autothority replaced the stock tires with Michelin's new Pilot Sport tire, adding an extra 10mm for the front tires (245/40) and a sizable 50mm in back (335/35ZR-18) on Fiske forged, three-piece wheels (9xl8,llxl8) anodized an ominous black. The result is heavier steering and a tad slower turn-in response. The tires also ask for a bit more steering to make the same arc as before. Its cornering attitude is much like the stock 993 Turbo, mild understeer, and it responds well to trail-braking in tight comers. The back end can be coaxed to step out with a stab of the throttle at the right time, and, again, like the stock Turbo, oversteer is corrected when the front wheels bail out a sliding rear end.

Lowered to the point where there's no gap in the wheelwells, it rides on an H&R coilover setup originally designed for the GT-2. Working closely with H&R, Autothority tested a variety of spring rates until it found the desired ride and handling setup. As expected, the ride is firm but not uncomfortable. The shorter travel stroke can get overworked by a series of big dips, but compared to the stock 993 Turbo, the H&R set does a much better job of controlling roll, dive and squat. The legendary Turbo brakes remain intact; Porterfield race pads are the only modification. Their initial bite isn't as immediate as the stock pads, and they require more heat and greater pedal effort to get working.

Driving the Autothority Stage 3 Turbo is the kind of experience that inspires delinquency. You become what proctologists look at all day. You look for gaps to squirt through and long lines of cars to pass, any excuse to get on it. Luckily, with the amazing brakes and the four-wheel-drive platform, you're allowed a bigger margin of error. You're forgiven for minor mistakes, incidents that are quickly forgotten when you get on the throttle and take off to that world where the brutal becomes the sublime. You never want to get out of the car.

After the apocalypse, after the earth has regenerated and started new life forms, the next forms of "higher" intelligence will unearth this beast and think Autothority's masterpiece was built in some secret skunkworks called Area 51.