When the German tuning haus of PPI turns its attention towards Audi's flagship sedan, it's safe to assume that a refined appearance will be complimented with big power.

The exterior of the PPI A8 Executive receives a thorough, if subtle redesign, in the form of front and rear bumpers that are so well incorporated that only the local Audi dealer could tell that they're aftermarket. The rolling stock is upgraded with 20" alloys and wrapped in Michelin Pilot Sport2 rubber. If you don't want the stock trim detracting from your dubs, PPI also offers a chrome delete package that replaces the trim with either carbon fiber or a matte black finish.

Aesthetics are all well and good, but it's what's under the hood that counts. Power upgrades to the stock, 4.2-liter V8 come in two flavors – naturally aspirated and blown. The NA option will produce 420 HP with a retuned ECU and exhaust upgrade. However, the real power comes when PPI straps on a twin-screw supercharger, a revised intake manifold, an air-to-air intercooler and programs a Motronic ECU to create 600 HP and 638 ft.-lbs. of torque. All those ponies can be sent through a reprogrammed transmission that will enable the 4,200-pound sedan to reach 60 MPH in 4.5 seconds.

Slowing down that considerable mass is left to 380 mm, cross-drilled rotors, matched with eight-piston calipers and an option to upgrade the discs to ceramic if your pocketbook allows. Vehicles equipped with Audi's air suspension will also receive a reprogrammed computer, which will reduce the A8's ride height by one and half inches.

We didn't compile a listing of what all this high-power, high-tech wizardry will cost, but we'd expect you could buy a brand new GTI if you decided to keep your A8 stock.

[Source: World Car Fans]