Customization in GTA 5 – Everything you need to know

Here is a quick rundown of official customizations that will be available in Grand Theft Auto 5.

Weapon Customization

• extended clips that allow you to fire more ammo between reloads
• grips to improve your accuracy
• weapon tints to color your guns
• flashlights
• scopes
• suppressors
• attachments such as suppressors for stealth

Car and Bike Customization

• 1,000 modifications in total
• body kits
• paint jobs/finishes
• wheels
• exhaust tips
• window tints
• tire smoke color
• bull-bars
• extra lights
• brakes
• engine tuning
• suspension
• horns
• bulletproof tires
• panel armor
• general repair

[source: Game Informer]