Dale Stewart from Seether CTS-V

April 14, 2025

GM Sigma II Platform (2008–2014): The Backbone of the Supercharged V

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.

cadillac cts v wagon pic02 v series cadillac

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

cadillac cts v wagon pic05 v series cadillac

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.

Cadillac CTS-V Wagon Engine

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

Cadillac CTS-V

Technical Specs (CTS-V LSA Engine)

Feature

Spec

Engine6.2L LSA Supercharged V8
Supercharger1.9L Eaton Gen IV roots-type blower
Horsepower556 hp @ 6,100 RPM
Torque551 lb-ft @ 3,800 RPM
Redline~6,200 RPM
TransmissionTremec TR-6060 6-speed (manual) or 6L90 6-speed automatic
0–60 Time3.9 seconds
Quarter Mile~12.0 seconds @ 115+ mph
BrakesBrembo 6-piston front / 4-piston rear
SuspensionMagnetic 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.)

ModelUnits 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.

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