

April 14, 2025
GM Sigma II Platform (2008–2014): The Backbone of the Supercharged V
vseries
The Sigma II platform was GM’s evolution of its rear-wheel-drive (RWD) architecture for Cadillac, and it laid the foundation for the second-generation CTS family — including what is arguably the most legendary V-Series model of all time: the 2009–2015 Cadillac CTS-V.
Built to be stiffer, safer, more refined, and more performance-capable than its predecessor, Sigma II marked Cadillac’s full-scale attack on the German luxury-performance segment, directly targeting the BMW M5, Mercedes E63 AMG, and Audi RS6.

Platform Development & Goals
Sigma II was developed by GM engineers in North America with extensive input from Cadillac’s Performance Division and track-tested at the Nürburgring in Germany. Major upgrades over Sigma I include:
Increased chassis stiffness for better ride and handling
Revised geometry and suspension tuning
Available with magnetic ride control
Adaptable for sedan, coupe, and wagon variants
Improved crash safety architecture
Support for supercharged V8 engines

Vehicles Built on Sigma II
1. 2008–2013 Cadillac CTS (Base Models)
Offered in:
Sedan
Coupe
Sport Wagon
Engine options:
3.0L V6 (270 hp)
3.6L V6 (304 hp, later 318 hp DI version)
All-wheel-drive (AWD) available
6-speed manual and automatic transmission options
The base CTS was more refined, stylish, and globally competitive than ever before — but it was the CTS-V lineup that stole the spotlight.

The CTS-V Family (2009–2015)
The second-generation CTS-V lineup used the Sigma II platform to redefine American muscle luxury — offering more horsepower than its German rivals and a level of chassis precision previously unseen from Cadillac.
CTS-V Sedan (2009–2014)
Engine: 6.2L Supercharged V8 (LSA)
Power: 556 hp / 551 lb-ft
Transmission: 6-speed manual or 6-speed automatic
0–60 MPH: 3.9 seconds
Top Speed: ~191 MPH (sedan)
Notable Feature: MagneRide adjustable suspension
CTS-V Wagon (2011–2014)
One of the rarest and most beloved V-Series models
Same powertrain as sedan and coupe
Total U.S. Production: ~1,764 units
Cult classic status among enthusiasts
CTS-V Coupe (2011–2015)
Sharp, aggressive styling
Slightly stiffer chassis than sedan
Same drivetrain and performance specs
Great balance of daily usability and track capability

Technical Specs (CTS-V LSA Engine)
Feature | Spec |
---|---|
Engine | 6.2L LSA Supercharged V8 |
Supercharger | 1.9L Eaton Gen IV roots-type blower |
Horsepower | 556 hp @ 6,100 RPM |
Torque | 551 lb-ft @ 3,800 RPM |
Redline | ~6,200 RPM |
Transmission | Tremec TR-6060 6-speed (manual) or 6L90 6-speed automatic |
0–60 Time | 3.9 seconds |
Quarter Mile | ~12.0 seconds @ 115+ mph |
Brakes | Brembo 6-piston front / 4-piston rear |
Suspension | Magnetic Ride Control (electronically adjustable) |
Curb Weight (Sedan) | ~4,260 lbs |
Notable Features and Options
Recaro performance seats with adjustable bolsters (optional)
Two-mode exhaust for improved flow and sound at WOT
MagneRide suspension tuned for both comfort and aggressive handling
Optional panoramic sunroof (sedan & wagon)
19″ forged wheels with Michelin Pilot Sport PS2s or Super Sports
Optional suede steering wheel and shifter
Launch control on manual transmission models
Track-Proven Pedigree
The Sigma II CTS-V wasn’t just powerful — it was track-proven.
In 2009, GM development driver John Heinricy piloted a CTS-V sedan around the Nürburgring Nordschleife in 7:59.32, making it the fastest documented time for a production sedan on factory tires at the time.
This achievement helped cement the CTS-V’s reputation as not just a muscle luxury car, but a world-class performance sedan.
Production Figures (Approx.)
Model | Units Produced (US) |
---|---|
CTS-V Sedan | ~19,700 |
CTS-V Coupe | ~8,600 |
CTS-V Wagon | ~1,764 |
These low production numbers — especially for the wagon — have made all Sigma II CTS-V models highly collectible.
Final Thoughts
The GM Sigma II platform pushed Cadillac into a new era of credibility, producing a lineup of high-performance vehicles that could finally go toe-to-toe with — and in some cases outperform — their European rivals. The LSA-powered CTS-V triplets are among the most iconic American performance vehicles of the modern era, and they remain hugely desirable in the enthusiast market today.
Whether you’re a proud owner, a hopeful buyer, or a fan of Cadillac performance history, the Sigma II platform is a cornerstone of the V-Series legacy.