well you are probably right.both will yield a bit of mileage increase most likely.The difference is everything else.Speaking from ALOT of personal experience and being very objective here,the banks kit is FAR superior in terms of quality,construction,ease of install and durability.Not necessarilly saying the gibson system is not decent,but you are not going to be comparing apples to apples here.Gibson has long been known to have fit problems with their exhaust (also personal experience),and they are generally louder than alot of the competition.Now,like I said being objective I have not seen this new system from them or heard it,but I do not expect they have increased their product quality by leaps and bounds over the last year when I installed one on a 97 chevy truck.PLus with what some of the nissan dealers here are offering the Banks kit for,it is a no brainer to get the Banks!..As you have read those of us who have installed it have loved what they got!..Nobody has tried the gibson and obviously it is not a hot item like the Banks kit.There is a reason for that!..Banks marketed right to the nissan dealers themselves where the trucks are sold and spent alot of $$ advertising the new system,has gibson?....not really!.Take my advise on this for what its worth;I have no doubt if you put the 2 systems side by side the Banks would be a lot nicer and would install on the vehicle MUCH better!