07-14 GMC Sierra LED Tail Lights Black Smoke Carbon LED produces noticeably whiter and

LED produces noticeably whiter and more intense light output

Check that the threaded bung in your manifold isn't clogged with carbon

If they're cracked or soft

Mesh covers

Any additional cooling system work (thermostat

07-14 GMC Sierra LED Tail Lights Black Smoke Carbon LED produces noticeably whiter and07 14 GMC Sierra LED Tail Lights Black Smoke LED tail lights with a smoked lens design swap directly into your Sierra's factory housing. Hard panel construction paired with integrated LED elements delivers sharper light output than stock incandescent units. Direct bolt on fitment eliminates the need for custom wiring or modifications. Ships from FL Warehouse Factory Mounting Points In House Quality Check Key Features LED Array Brighter, longer lasting