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aFe Twisted Steel Header SS-409 HDR Nissan Frontier/Xterra 05-09 V6-4.0L GuniWheel Magnaflow have logged gains ofaFe Twisted Steel Header SS 409 HDR Nissan Frontier Xterra 05 09 V6 4. 0L The new Twisted Steel performance header from aFe Power is redefining the header industry with new pulse control technology. aFe engineers have designed this header using optimum tube lengths and mitered collectors for maximum flow and velocity for power delivery across the entire power band. Combine with a large 1 2" thick head flange and 14 gauge 409 stainless steel tubing,