In all seriousness years ago when I did this upgrade I did see a big difference but I did a lot of testing and found the one high resistence area after doing the big three was the main charging line fuse I had added in between the battery+ and alt +output terminal when I removed that I noticed almost a volt in the end as well, But as some one else pointed out a cars electrical system is meant to maintain a charge under normal conditions carrying passengers and maybe some luggage, Now let's look at our cars Generally more then one battery a few hundred pounds of mdf and magnets and an alt that is having hundreds of amps drawn from it and it's battery as well, your no longer using the car for it's built purpose now you must change it not so much an upgrade it's just now setup correct for what it's being asked to do.