It just depends on what OP is going for. If your going for that "sense of occasion" like driving the car is something like a special occasion and you aren't worried about this or that then just try the deletes, nameless is a couple hundred bucks for the deletes, you don't like them I promise you could resell them in a week to another guy, for sure, or if you are just wanting alittle something added to your sound then go the 4"route. I think of it like a Ferrari or Gt350r or something that has a sense of occasion to it, like driving the car is something to be enjoyed and special so I want the sound, anyone who hasn't rode in a car with a nameless delete has no idea.. it's just not that crazy. If your talking twin straights out the back yea, that's going to sound different for sure and I wouldn't go that route, and as one user stated just drill some holes in your mufflers won't give you a good idea for sound other than what a ****ty exhaust leak would sound like. Their are certain frequencies that aren't in the car anymore that at lower rpms with the stock exhaust was a definite drone, they don't exist with the nameless. Their is no drone. But, it's either quiet or not quiet, but not crazy obnoxious. These threads are pretty subjective and your not really going to get a clear answer until you ride in the set up your thinking about. That is the only time you'll know. I also somewhat disagree with the you can't get any real info from youtube. Yea most videos sound quality is bad, but a few out there aren't. You can get an idea of tone anyways, but like I said, you literally have to try what your thinking or find someone with the set up you are thinking of to really know what your in for.
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