I decided to do a complete exhaust from the manifolds back and was wondering what kind of gains can I see with LT's as compared to with shorty headers. I know installing the Lt's are a pain in the ass but I will deal with that when it comes to installing them. Are LT's worth it? I know they make a difference in forced induction applications but what about NA? Also does exhaust leak hurt performace or gas mileage in anyway? thanks for all of your help.