Anyone know how to replicate this sort of sound?

melvinmelvin, do you mean you have no mufflers at all? Why do you step through pipe diameters? Is that a way to create/eliminate some resonances?
right, have no mufflers

the different pipe sizes have to do with space constraints
cannot do 4 * 3 inch all the way
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I think I have just found a much better approach to the sound I was looking for

It's chambered muffler without any packing. Having played with Glasspacks much enough, I decided that ' s "mufflers" would be way too loud for me due to their size (not enough width), so I just obtained the part of maximal dimensions I could fit...from some trusted vendor