Okay so I am getting this sort of a “hissss” from my tail pipes when you rev the engine from a stop and after te revs start to go down it hisses. I just now noticed this so I think it’s normal?!?? Sounds cool though ha ha ha. Does anyone know WHY it does this? I’ve heard that this car as an unrestricted exauhst system and not sure if I go to upgrade it from headers to tips with a free flowing cat is that going to hinder it at all compared to te stock system or what the real world benefits are from putting on an aftermarket system like that on. Again with the hissing. What’s up with that?