SPELAB Exhaust Header for 1997-2001 Chevy Blazer GMC Jimmy 4.3L V6 Duramax Downpipe Hot exhaust gasses are not

Hot exhaust gasses are not being re-routed back into the motor

Go from closed to open or open to closed with just the flip of a switch

7L Powerstroke owners upgrading crankcase ventilation

A4:The SPELAB Typhoon Intake Manifold is designed to significantly enhance both top-end power and low-end torque

Header Dimension B 11

SPELAB Exhaust Header for 1997-2001 Chevy Blazer GMC Jimmy 4.3L V6 Duramax Downpipe Hot exhaust gasses are notSPELAB Exhaust Header for 1997, 1998, 1999, 2000, 2001 Chevy Blazer GMC Jimmy 4. 3L V6 Replacing or upgrading your exhaust header is necessary for both engine performance and sound. Whether on or off the track, exhaust headers provide more horsepower and improved exhaust sound. SPELAB offers many products to help you create your own custom engine headers. It's really easy and convenient to use: direct bolt on, no modification needed. Fitment: 1997