3.0" T4 Turbo Downpipe Exhaust for 1999-2013 Chevy Silverado & GMC Sierra 4.8/5.3/6.0/6.2L vortec LS

Upgrade your 1999–2013 Chevy Silverado or GMC Sierra's exhaust flow with the Flashark 3.0" T4 Single Turbo Downpipe. Engineered specifically for Vortec LS V8 swap builds and single turbo setups, this downpipe replaces the restrictive factory exhaust routing with a free-flowing 3-inch stainless steel pipe — delivering faster turbo spool, improved throttle response, and a more aggressive exhaust note.

Includes a 90-degree outlet tube and V-band clamp for clean, leak-free installation. A factory O2 sensor bung and block-off plug are pre-welded, making it compatible with both catted and catless configurations.

Key Features

• 3.0" (76mm) Pipe Diameter — maximizes exhaust flow for turbocharged LS applications
• T4 Turbo Flange — direct bolt-on fit for T4-flanged single turbo kits
• 90° Outlet Tube Included — allows flexible routing within the engine bay
• V-Band Clamp Included — provides a secure, rattle-free connection at the outlet
• Pre-Welded O2 Bung + Block-Off Plug — supports wideband O2 sensors; plug included if not needed
• Mandrel-Bent Construction — maintains a consistent inner diameter throughout for unrestricted airflow
• Mirror Polished Finish — clean, professional look under the hood

Why Upgrade?

The factory exhaust manifold and routing on Vortec LS trucks were designed for NA use — they choke turbo flow, limit spool speed, and cap your power ceiling. This downpipe opens up the exhaust path from the T4 turbine exit, letting spent gases escape faster so your turbo builds boost earlier and your LT1/LS pushes harder through the entire RPM range.