Boom Tubes

[N1GHT]

Looking at doing boom tube side exits on my 2006 Mustang GT, the few i’ve found for sale are an arm and a leg so I was going to weld and fabricate my own. I’ve seen lots of different dimensions and kinds, all producing a different sound. Could anyone guide me and give me direction as to what dimensions would give me a deep rumbly muscle car sound? Hope it’s not a dumb question �� but anyone who can point me in the right direction i’d really appreciate!! Aswell as when I make them should I use aluminum or stainless steel or something else ?