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MagnaFlow Muffler Mag SS 7X7 14 4.00/4.0 - mag12770 missing-image 6599cc Programmers & Chips::Programmers &MagnaFlow Performance mufflers are 100% stainless steel and lap joint welded for solid construction and rugged reliability even in the most extreme conditions. They feature a free flowing, straight through perforated stainless steel core; stainless mesh wrap and acoustical fiber fill to deliver that smooth, deep tone. MagnaFlow Mufflers are packed tight with this acoustical material to ensure long life and no sound degradation over time. PartNumber :