Pacesetter performs much better...the hookers are 1-5/8" primaries and pacesetters are 1-3/4"....the hookers might make power more in the low end, more torque...but overall I think you would be much happier with Pacesetters, I'm putting Pacesetter Longtubes and ORY on my truck this Tuesday
EDIT: If you're talking about shorty headers, none of them will perform any better than ur stock manifolds....shorties do nothing on 99+ trucks
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