Nothing fancy needed. My old Kia had the cheapest straight through muffler I could find, and the increase was wonderful on that car. If you were doing a full exhaust (headers and all) than I would spend the extra cash and get a full matched kit.
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2000 Stratus ES / V6 / Leather / Tint / 173,500mi
2003 Town & Country Limited / V6 3.8 / Heated Leather / Auto A/C / DVD / 102,000mi
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