If it is a cat-back exhaust, it would be extremely difficult for them to deny you the warranty since it does not interfere with any sensors or puts any additional strain on any part of the car. The only advantage to having the dealer do it is that you can get it in writing that it will not void your warranty since the work was performed by them.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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