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1) you wont make more than maybe 4, to 5 wheel HP on a catback..
2) an exhaust cannot void your powertrain warranty, unless they can prove it caused the issue you're having...
i work for an infiniti dealership, we don't care if you put an exhaust on your car, especially if its a catback/axelback. if you remove the cats, thats a different story.
happy modding!
if your worried about warranties, stay away from tunes, and welcome things like a well built intake, an exhaust, ported TB.
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