Anyone know how to replicate this sort of sound?

The 1UZFE EGR Delete Kit is available for sale here.
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