Cat4ward Stainless Steel Titanium Ceramic Coated Short Tube Exhaust Headers (1823SJT) by JBA®. Primary Tubing Diameter: 1.75". Collector Outlet Diameter: 2.5". Color: Gray. Header Coating: Ceramic. Header Style: Short Tube. JBA shorty headers are one of the best performance upgrades available for any application. Hot Rod magazine rated headers as one of the top 10 power parts installed on a vehicle. JBA shorty headers are significantly less restrictive than the stock manifolds on a vehicle and dramatically increase the power and efficiency of an engine. JBA's original shorty design is an innovation of the old long tube header. The new shorty designs yield high performance gains that hot rodders and enthusiasts look for.