Still running the stock exhaust on my 2000 model also. Removed the muff and kept the resonator when the truck was almost new, it sounds too good to change - ha!.
I plan on getting a 4" that is just a tad quieter than how it is now, just havent decided which way to go, which is why it hasnt been done yet. (Straight pipe with twins - or single with a muffler). Also will need to do something about the 3. 5 inch BD brake on the turbo.
Have been waiting for a twin setup to come out that utilizes the stock HX-35, and possibly has a provision for an exhaust brake, and what would be ideal is to have the brake come with the twin setup.
Also, would like the exhaust tip to look as close to stock as possible (the 2000 has the diagonal cut tip).
Thanks for asking. .