BSI Inc. 45mm External Wastegate Take precise command of your boost with a wastegate built for serious turbo applications — from street-driven builds to all-out performance. Features & Benefits External Mounting for Superior Boost Control: Unlike internal wastegates, an external design diverts exhaust gases away from the turbine wheel independently, giving you cleaner, more consistent boost control and sharper response across the entire powerband. 45mm Valve Diameter: The 45mm valve size hits the sweet spot for medium-to-large turbocharger applications — large enough to flow exhaust efficiently at higher boost targets, without the added bulk and plumbing demands of a 50mm unit. V-Band Inlet & Outlet Connections: Slip-fit v-band connections on both the inlet and outlet make installation, removal, and servicing straightforward — no wrestling with awkward flanges mid-build. Stainless Steel Construction: Built from stainless steel for long-term corrosion resistance, whether your rig faces humid summers, road-salt winters, or year-round performance use. Multiple Spring Rate Options: Dial in your base boost pressure with selectable spring rates to suit your specific build and target boost level. Pair it with a boost controller for even finer adjustment. Universal Fitment Across Turbo Builds: This is a universal external wastegate compatible with gas and diesel turbo builds alike — including high-output diesel truck applications and purpose-built performance setups. Built for Boost Control Authority Whether you're building a weekend bracket car or pushing your daily driver further than the factory ever intended, the BSI Inc. 45mm external wastegate gives you the boost control authority your build deserves. FAQ What is the benefit of an external wastegate? An external wastegate diverts exhaust gases away from the turbine wheel independently, helping deliver cleaner, more consistent boost control and sharper response across the powerband. What turbo applications is the 45mm valve size suited for? The 45mm valve size is suited for medium-to-large turbocharger applications, flowing exhaust efficiently at higher boost targets without the added bulk and plumbing demands of a 50mm unit. What type of connections does this wastegate use? It uses slip-fit v-band connections on both the inlet and outlet to make installation, removal, and servicing straightforward. Can I adjust the base boost pressure? Yes. Selectable spring rates allow you to dial in your base boost pressure to suit your build and target boost level, and it can be paired with a boost controller for finer adjustment. Is this wastegate compatible with diesel and gas turbo builds? Yes. This is a universal external wastegate compatible with gas and diesel turbo builds, including high-output diesel truck applications and purpose-built performance setups.
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