Engine

Engine upgrades in Need for Speed: Underground 2 can be applied to increase acceleration.

The effectiveness of an individual part is dependent on the package they are included in;

• Street - Low increase of acceleration
• Pro - Moderate increase of acceleration
• Extreme - High increase of acceleration
• Unique - Increases stock acceleration without adding new parts

Upgrades

Package	Part	Price	Unlock
Street	Cold Air Intake System	250	Available from start
Street	Mild Camshaft & Cam Gears	250	Available from start
Street	Performance Exhaust	500	Available from start
Street	Replace Headers	500	Available from start
Pro	Cat Back Exhaust System	1.000	Win 15 races during Stage 3 of the career mode
Pro	High Flow Intake Manifold	500	Win 15 races during Stage 3 of the career mode
Pro	Larger Diameter Downpipe	500	Win 15 races during Stage 3 of the career mode
Extreme	Blueprint the Block	1.500	Complete Stage 4 of the career mode
Extreme	High Flow Headers	500	Complete Stage 4 of the career mode
Extreme	Port and Polish Heads	1.000	Complete Stage 4 of the career mode
Extreme	Racing Camshaft and Gears	500	Complete Stage 4 of the career mode
Unique	-	-	Win 3 Outrun races during Stage 3 of the career mode

Incompatible Parts

• Mild Camshaft & Cam Gears - Racing Camshaft and Gears
• Performance Exhaust - Cat Back Exhaust System
• Replace Headers - High Flow Headers

Notes

• Engine upgrades will change the exhaust sound of any vehicle.