The exhaust manifolds found in the 1978-1991 Buick Chevy Oldsmobile and Pontiac Small Block engine were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 Mid-Length off-road headers are designed to allow the exhaust gasses to flow more freely from each 4 cylinder bank and combine in a more efficient manner. Tubing has been optimized for the 5.0L(305ci) and 5.7(350ci) engines. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.
100% brand new, Never been tried or installed
Made of High Quality T304 Stainless Steel Material
Inlet/ Outlet: 1.50"/ 2.50"
O2 Sensor Bung Insertion and Metal Gasket Included
TIG Welded CNC Machine Flange
Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq.
No instructions included
Professional installation is highly recommended
1 X Set of Header Exhaust System
Gasket(s) and Bolt(s) as shown if Any is Shown in the Picture Above
305-350 CID Engine Small Block
Please Check Compatibility
Product Disclaimer: This product is not designed to meet emissions/noise standards and is not for street or highway use. This product is not certified and may not be legal for use on emissions-controlled vehicles in any country/jurisdiction. Any other use, including recreational off-road, may violate local, state, and federal laws. Dynamic Performance Tuning does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the customer's responsibility. Dynamic Performance Tuning will not ship CARB restricted products into CARB restricted areas under any circumstances. ***OFF-ROAD USE ONLY***