From above link Comparison Tests:

Bling Quartet: D3 Cadillac CTS
Stylish, reliable and frighteningly quick, these four cars represent a new standard in tuning.
[/size]By Sam Mitani[/size]•Photos by John Lamm, Jeff Allen, & MCF`Space : )
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Slideshow: Bling Quartet >>
Slideshow: D3 Cadillac CTS >>
Lap Time: 1:34.94
You may wonder: What the heck is a V-6-powered luxury sedan doing in this mix? It's an understandable reaction considering that the new Cadillac CTS is not exactly a 911 competitor, but don't forget that it's powered by a 304-bhp direct-injection V-6. And it's actually a decent handler, witnessed by its performance around the Streets of Willow Springs. Our stock all-wheel-drive CTS completed a lap in 1:40.05, reaching a top speed of 95.6 mph. The car's balance through the corners was impressive, with ample power coming out of the turns, but the lack of grip from the Michelin P235/50ZR-18s slowed the stock CTS through the tight sections.

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Then the D3-tuned CTS destroyed the stock CTS's lap time on its first lap out. Where one second is a lifetime on this short, tight track, the D3 ran more than 5 sec. faster. In the end, the D3 registered 1:34.94. To be fair, the awd CTS is about 250 lb. heavier than the rear-drive D3 version, but it was the D3's suspension tuning and braking that played the biggest role in its dominance. (Note: Only an all-wheel-drive version of the stock CTS was available at the time of testing.)





The GT Channel was there for our comparison test. Check out these hot videos:

D3 engineers installed KW's coil-over kit to the car's unequal-length A-arm suspension up front and multilink setup at the rear. They also lowered the body about an inch, which helps to reduce body roll. The result is a somewhat firm ride, but in exchange, you get improved steering feel and super-crisp turn-in response. The car's sticky Toyo Proxes R888 tires also helped the cause. The stock brakes were swapped with D3's custom Big Brake Upgrade System that uses giant 15.0-in. rotors all around with 8-piston calipers up front and 4-piston at the rear. This setup proved to be so powerful that the D3 outbraked every car in this test, stopping from 60 mph in 109 ft. and from 80 mph in 192 ft. In fact, while we were performing our tests, the D3's stopping power was so forceful that an OnStar operator called, asking if the car had been in a front-end collision.
The D3 smoked the stock CTS through the slalom and around the skidpad, registering 68.5 mph and 0.87g respectively, while the stock CTS managed 62.8 mph and 0.84g.

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KidSpace would love to see the below engine in a Monte Carlo 4-Sure [:-]
Under the hood, D3 kept changes minimal. There's a custom intake system with a heat shield and a Corsa exhaust that not only improves flow, but gives the car a menacing roar during acceleration. The D3 CTS's 3.6-liter VVT DI (Direct Injection) V-6 produces 340 bhp at 6600 rpm and 292 lb.-ft. of torque at 4380. This allows the transformed car to get to 60 mph in 6.1 sec. and to the quarter mile in 14.5. (The company is working on a supercharged model; see "Sweet Science — The Art of Tuning.")
Cadillac has done a wonderful job with the CTS, producing a car that can hold its own against its European counterparts. For those who desire a little more than the usual, upgrading to D3 trim is definitely the way to go. D3 components and parts are available at Cadillac dealerships or directly through the company. This particular setup goes for $15,000, and you can see from our lap times of the D3 CTS, it's worth every penny.
D3 R&D: (866) 988-2090, [color=#0000ff]www.d3cadillac.com