Fabspeed 991.2 GT3/GT3 RS Sport Headers with HJS Catalytic Converters (FS.POR.9912GT3.SHDR) _175.25 We put in the time

We put in the time to test and prove that we have developed a superior kit for your 2019-2020 GM Silverado/Sierra 1500 truck

It fits perfectly in the OEM air box and is built with the highest quality materials

GrimmSpeed chose to use the exact same pull that tested the performance of our J-Pipe/Downpipe as the baseline for our 2015 WRX

VOLUME – FLOW QUALITY – TEMPERATURE are the 3 main design criteria which we sought to meet

Fabspeed 991.2 GT3/GT3 RS Sport Headers with HJS Catalytic Converters (FS.POR.9912GT3.SHDR) _175.25 We put in the timeWhy We Choose HJS Catalytic Converters: HJS German imported catalytic converters are made from some of the highest grade materials you can find in a catalytic converter. This yields high performance gains and longevity so it wont deteriorate over time like lower grade catalytic converters. These catalytic converters flow up to 93 95% of a straight pipe in most applications. The benefit is that you get the "straight pipe sound" while still being able