Chambered Muffler Tubes Please Help

[DirtyK30]

Its time to redo the exhaust on my crew cab and i am looking for a sound similar to that of the late 60’s Chevelles and Camaros with the chambered exhaust factory option. I have found a few websites that custom make this style muffler as it seems they are no longer mass produced. My truck is a stock 1986 454 and I was planning to run a full 3in dual exhaust with headers and h pipe. I understand that the sound of the old muscle cars is due in part to the cam choice but I just want something close for now and ill deal with the cam later. So my questions are

1) has anyone used any of these companies, if so is their product any good?

2) is there anyone else that makes this style muffler?

3) if anyone has experience with these mufflers is their any change in tone that would result by using a 3in dia. muffler tube opposed to say a 2 ¼ in

4) How does the over all length of the tube change the tone of the exhaust?

Here are links to the companies I found, and I attached a picture of the mufflers I’m talking about for clarity’s sake
http://www.madhammer.com/pages/mad_h...prod_modu.html
http://www.stainlessworks.net/produc...-mufflers.html
http://classicchambered.com/
http://www.sweet-thunder.com/chamber..._chevelle.html

Thanks in advance!