2004.5-2005 Duramax LLY HSP Max Flow Bridge to Factory Cold Side (206-HSP)

The 206-HSP HSP Max Flow Bridge to Factory Cold Side is a bolt-on LLY Y-bridge upgrade for 2004.5–2005 Chevrolet and GMC Duramax trucks. This LLY Duramax Y-bridge kit is designed to increase airflow and reduce boost leaks while retaining compatibility with the OEM factory cold side tube.

Why Upgrade to an LLY Y-Bridge?
The factory bridge on the 2004.5–2005 LLY Duramax can become a restriction as airflow demand increases. An upgraded Y bridge for LLY Duramax improves flow to support better throttle response and turbo spool-up, while also addressing common sealing issues that can lead to boost leaks.

What Makes the HSP Y Bridge for LLY Duramax Different?
HSP designed this LLY Y bridge as a 3-inch precision-cast and CNC-machined two-piece bridge that connects to the stock cold side system. The two-piece construction helps simplify installation, improves sealing, and delivers a noticeable airflow improvement compared to the OEM bridge setup.