Recent owner of 2013 300 SRT-8. Previous owner of 2007 300 SRT-8. The 2007 I installed cold air induction and cat back exhaust which made a definite improvement. I have looked at many of the forums here and have not seen any proven performance by doing the same on a 2013 other than sound. Maybe Chrysler got it right before they discontinued it in 2014. Looking for suggestions, or a past thread I might have missed.