The 2000 Bonneville was redesigned from the ground up with significant advancements in design, engineering and technology which Pontiac dubbed "luxury with attitude."
The Bonneville was now built on GM's G platform,but GM chose to continue to refer to it as the H platform.
Staying true to Pontiac's Wide Track heritage it had the widest overall track in its competitive class at 62.6 inches up front and 62.1 inches (1,580 mm) in the rear.
GM's StabiliTrak stability control system was introduced on the top-of-the-line supercharged SSEi model, later replaced by the GXP.

The Bonneville regained a V8 option on the GXP trim for 2004, its first since 1986, as a result of the discontinuation of the Oldsmobile Aurora.
This opened up a "hole" in the GM lineup between Pontiac and Buick, allowing Pontiac to expand upmarket somewhat.
The engine is Cadillac's 4.6 L (280 cu in) Northstar V8, producing 275 hp (205 kW), 300 lbf⋅ft (410 N⋅m) and as Pontiac's website said, "With GXP, V8 power gets reintroduced into the Bonneville line in the form of the world-renowned 4.6 L (279 in³) Northstar V8 engine, giving 0 to 60 mph (0–97 km/h) in 6.5 seconds demonstrates better performance than BMW 330i and 530i, and Lexus ES.
Its 3.7:1 final drive ratio is the most aggressive found on any car in its class."

NHTSA crash tests for the 2005 Pontiac Bonneville resulted in a safety rating of 4-stars for the Driver and 5-stars for the Front Passenger.

 For the last year of production, Pontiac gave the mid-level SLE the new GXP styling.
The 2005 SLE featured all GXP styling cues, except the wheels, badging, muffler tips and engine all remained unique to the GXP.
The 2000 Bonneville was redesigned from the ground up with significant advancements in design, engineering and technology which Pontiac dubbed "luxury with attitude." The Bonneville was now built on GM's G platform,but GM chose to continue to refer to it as the H platform. Staying true to Pontiac's Wide Track heritage it had the widest overall track in its competitive class at 62.6 inches up front and 62.1 inches (1,580 mm) in the rear. GM's StabiliTrak stability control system was introduced on the top-of-the-line supercharged SSEi model, later replaced by the GXP.
The Bonneville regained a V8 option on the GXP trim for 2004, its first since 1986, as a result of the discontinuation of the Oldsmobile Aurora. This opened up a "hole" in the GM lineup between Pontiac and Buick, allowing Pontiac to expand upmarket somewhat. The engine is Cadillac's 4.6 L (280 cu in) Northstar V8, producing 275 hp (205 kW), 300 lbf⋅ft (410 N⋅m) and as Pontiac's website said, "With GXP, V8 power gets reintroduced into the Bonneville line in the form of the world-renowned 4.6 L (279 in³) Northstar V8 engine, giving 0 to 60 mph (0–97 km/h) in 6.5 seconds demonstrates better performance than BMW 330i and 530i, and Lexus ES. Its 3.7:1 final drive ratio is the most aggressive found on any car in its class."
NHTSA crash tests for the 2005 Pontiac Bonneville resulted in a safety rating of 4-stars for the Driver and 5-stars for the Front Passenger.
 For the last year of production, Pontiac gave the mid-level SLE the new GXP styling. The 2005 SLE featured all GXP styling cues, except the wheels, badging, muffler tips and engine all remained unique to the GXP.
Pontiac Bonneville