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the ceramic coating keeps the exhaust temp high which facilitates good flow. my crossover pipe had to be cut and re-welded for them to fit right, but mine are TOG's which aren't produced anymore. S&S should bolt right up. i am assuming you have a 3400. i dont know anything about 4 cylinder headers.
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2015 Audi SQ5
2000 Alero GLS Coupe - still in the family, but I don't drive it anymore
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