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  1. Exhaust Questions...07

    Titan Performance Modifications
    i have an 07 titan, if i remove the secondary cats will the check engine light come on? will i lose or gain horsepower or will it just be louder? True Dual, ive read on here you will lose HP do to the backpressure, so some have said get a muffler with dual in dual out<will that add any more...
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