3500/3700 Performance Series

Built specifically for the GM Vortec 3500/3700 inline-five platform, this Performance Series brings custom fabrication quality to a growing community of enthusiasts. Every manifold, flange, and hardware kit is designed and tested fit in-house for perfect fit, strength, and performance. Whether you’re boosting, swapping, or refining your 3500/3700 setup, these parts deliver precision-engineered results backed by real-world experience.