Wow... some people like to hear the sound of their engines... id rather drive the ugliest fastest car than the prettiest slow car, that being said muffler/exhaust modifications are when done correctly designed to let the engine expel exhauste more efficiently, and the only downside is more volume, which for most who would do this is another plus
Car makers have to make their vehicles pleasing to a wide variety of people, a quiet exhaust appeals to the majority of the elderly, most women, and others that would find exhaust volume intolerable, however alot of men, women, and young people in general enjoy hearing the engine of their cars, and it is no more annoying than a semi, or Harley etc...
But back on topic, change your oil, and if it is just a low clicking( lifter noise) don't worry about it, if it is knocking or you're still real worried than if you can find someone nice enough in you area with the same make and model you could bolt on their stock muffler ( if you cut yours behind the connection) and switch your intake to stock and take it in to the dealer have it looked at and not worry about the slightest possibility of warranty denial.
Personally I don't see how anything behind the o2 sensor could cause engine problems...even then I would think the car would throw a cel before something like rod knocking would happen Maybe how hard you drive it is something actually worth looking at.
Car makers have to make their vehicles pleasing to a wide variety of people, a quiet exhaust appeals to the majority of the elderly, most women, and others that would find exhaust volume intolerable, however alot of men, women, and young people in general enjoy hearing the engine of their cars, and it is no more annoying than a semi, or Harley etc...
But back on topic, change your oil, and if it is just a low clicking( lifter noise) don't worry about it, if it is knocking or you're still real worried than if you can find someone nice enough in you area with the same make and model you could bolt on their stock muffler ( if you cut yours behind the connection) and switch your intake to stock and take it in to the dealer have it looked at and not worry about the slightest possibility of warranty denial.
Personally I don't see how anything behind the o2 sensor could cause engine problems...even then I would think the car would throw a cel before something like rod knocking would happen Maybe how hard you drive it is something actually worth looking at.
