The Ultimate in Buick V6 & V8 High Performance Parts. The Buick Power Providers. Featuring Stage 1, 2, 3, 4 Aluminum Cylinder Heads, Intakes, Headers, as well as many stock and restoration type drivetrain components. We are also the leader in Mandrel Bent exhaust systems for GM Muscle Cars. Check out our World Famous Rear End Girdles, for most popular differentials!