ARH LongTube 1-5/8 304-SS Headers off Road + X Pipe for 2005+ Mustang GT.
These systems are all 304 stainless and feature 3/8" thick flanges with hand ported inlets, merge collectors with scavenger spikes, severe duty high flow metallic cats and X-crossover. They're designed to bolt in with no welding or fabrication. Headers are available with 1-5/8" (for normally aspirated) or 1-3/4" (supercharged) primaries.
Every header system comes with a full 2 year warantee from date of purchase against defects in materials and workmanship. | 
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