# Need For Speed: Carbon (multiple threads merged)

**URL:** <https://forums.speedlife.net/t/need-for-speed-carbon-multiple-threads-merged/19653>\
**Category:** NYSpeed Off Topic\
**Created:** [October 24, 2006, 9:06am UTC](https://forums.speedlife.net/t/need-for-speed-carbon-multiple-threads-merged/19653 "2006-10-24T09:06:48Z")\
**Posts on this page:** 1\
**Showing post:** 53

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**Author:** ![boardjnky4](https://avatars.discourse-cdn.com/v4/letter/b/96bed5/32.png) [@boardjnky4](https://forums.speedlife.net/u/boardjnky4)\
**Post date:** [December 23, 2006, 3:15pm UTC](https://forums.speedlife.net/t/need-for-speed-carbon-multiple-threads-merged/19653/53 "2006-12-23T15:15:31Z")

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theres 3 different tiers of cars

so when u unlock tier 1 upgrades, that means u can only use those upgrades on tier 1 cars. take a look at ur cars, and u’ll see that they are also labeled by there “tier”

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