As usual, this is the best information I've been able to gather; some of it may be incorrect.  And the indents may display incorrectly ... sorry, but it's too much trouble to fix at the moment.

9-5 General information

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Available as sedan or wagon

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Sedan is 4 doors, not a hatchback

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3.0 liter V6: “Asymmetric” low pressure turbocharged (LPT) V6
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General Motors design

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4 valves per cylinder

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Dual overhead camshafts

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Standard timing belt (needs periodic replacement)

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200 hp @ 5000 rpm

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229 ft-lb torque @2500 rpm (through 4000 rpm)

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Available only with automatic transmission

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2.3 liter inline 4
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Longstanding Saab design

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4 valves per cylinder

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Dual overhead camshafts

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Dual balance shafts

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Timing chain (does not need periodic replacement)

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Low pressure turbo (LPT) model:
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170 hp @ 5500 rpm (185 hp from 2001 onward)

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207 ft-lb torque @1800 rpm (through 3600 rpm)

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High output turbo
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1999 – 2001: 230 hp, 258 lb-ft torque

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2002 - 2004: 250 hp,259 ft-lb torque (244 ft-lb for automatics)

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2005: 260 hp

9-5 Engineering features

bulletFront and rear subframes
bulletFront suspension type: struts
bulletRear suspension type: Fully independent split axel
bullet“Drive-by-wire” electronically managed throttle
bullet“Electronic brake force distribution” (EBD)
bulletelectronically manages braking effort to each wheel
bulletacts before ABS (which prevents wheel lockup)
bullet“Active” ignition key for anti-theft protection
bulletKey battery needs periodic replacement

Debuted in US in 1999 model year with the following features:

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Four wheel independent suspension

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Front & side airbags

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Antilock braking system (ABS)

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Dual climate control

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Ventilated front seats (optional, V6 model only)

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Wheels: variation on Saab 3-spoke design on base model; 5-spoke on SE model; 10-spoke appears to have been an option

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SE model appears to have been available with either the 4 or 6 cylinder engine

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Wood-look dash trim was included in the up-scale models

2000 Model Year

bulletTraction Control System (TCS) standard on all
bulletApparently vastly superior to the 9000 version
bulletSunroof standard on all bulletWood-look dash trim still on up-scale models bulletWheels:
bullet5-spoke design
bulletA 17” open, “spidery” 10-spoke design was optional on all
bulletFirst year for Aero
bulletSport suspension
bulletUpgraded brakes
bulletMany Aeros were ordered with the 17 inch 10-spoke wheel design
bulletLow profile tires
bulletSE model
bullet3.0 liter 6 cylinder, auto transmission
bulletAuto-dimming night rear view mirror
bullet16” 5-spoke wheels (standard)
bulletEntry level model
bullet170 hp 4 cylinder
bulletPremium package available
bulletLeather
bulletMemory for driver’s seat
bulletHarmon Kardon audio

2001 Model Year

bulletAvailable models: Entry level, SE and Aero
bulletOnstar made standard equipment on all models
bulletGlass sunroof made standard on all models
bulletOne-piece key/remote transmitter
bulletWood-look dash trim still on up-scale models
bulletEntry level model
bulletBase engine upgraded to 185 hp
bulletAvailable with 4-speed auto or 5-speed manual transmission
bulletVelour fabric interior standard
bulletPremium package optional
bulletLeather
bulletPower seats (memory on driver’s side)
bulletPower memory mirrors
bulletHarmon Kardon audio system
bulletThe standard entry level wheel was a “classic” 10-spoke
bulletCould be ordered with the optional 17 inch 10-spoke “spidery” wheels
bulletSE model
bulletV6 only, 4-speed automatic only
bulletPremium package (see 4th bullet above) was standard
bulletAuto-dimming rear view mirror
bulletThe standard SE wheel was the 16” 5-spoke
bulletCould be ordered with the optional 17 inch 10-spoke “spidery” wheels
bulletAero model
bulletPremium package was standard
bulletAuto-dimming rear view mirror
bulletSports chassis (stiffer suspension)
bulletExternal trim (ground effects)
bulletLeather-wrapped steering wheel
bulletThe standard Aero wheel was a Saab 3-spoke variant
bulletCould be ordered with the optional 17 inch 10-spoke “spidery” wheels

2002 Model Year

bulletBase and SE models renamed Linear and Arc
bulletSame specs as previous years
bullet “Adaptive” 5-speed automatic replaces 4-speed automatic bulletSubtle exterior changes bulletImproved steering and suspension bulletElectronic Stability Program (ESP) standard on Arc, Aero, optional on Linear bulletXenon headlights optional bulletEnhanced airbags and crash safety bulletAero upgrades/changes
bulletincreased to 250 hp
bulletAluminum-look dash trim replaced plastic “burl wood” dash trim
bulletNew 10-spoke wheels
bulletAluminum-look dash trim replaced wood-look

 

2003 Model Year

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Aero wheels same as for 2002

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Paddle shifters introduced for auto transmission (Aero only???)

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Last year for weather radio band

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Dark wood-look dash on entry-level models

 

2004 Model Year

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New 5-spoke Aero wheels
bulletConstant-width, un-tapered spokes

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Aero horsepower increased to 260