Not sure which 2001 GMC Sierra Exhaust Headers & Manifolds are right for you? We have over 918 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"These headers really helped wake up the bottom end of my truck. Construction and finish are excellent. These are probably the best header out there for a 4x4 truck that needs all the low end torque they can get. The 310Y is a long tube headers and gives you the best power band, better than the newer midlength model." —Brad S from Franklin, OH bought a Doug Thorley Headers for a 2001 GMC Sierra.