I think for the most part a louder muffler will add HP, even if they say does not need a tune likely taking you to the lean side as there is nothing adjusting fuel for this. And 20HP (free flowing muffler) could get into into over-boost- your sled will cut out and not run on stock tune. And not 100% sure on this but thinking over-boost would be recorded in ECU, so on a warranty claim they could look at this? I would stick with the stock muffler if don't want to go further than this.I also mentioned sound. And an extra 10-20hp wouldn't hurt. Just sayin
Thats a good point, I didn't consider overboost getting recorded.I think for the most part a louder muffler will add HP, even if they say does not need a tune likely taking you to the lean side as there is nothing adjusting fuel for this. And 20HP (free flowing muffler) could get into into over-boost- your sled will cut out and not run on stock tune. And not 100% sure on this but thinking over-boost would be recorded in ECU, so on a warranty claim they could look at this? I would stick with the stock muffler if don't want to go further than this.