Wish I could help but yeah, ur gonna have to make it as stock appearing as possible. I got lucky and passed with no DPF on my '06 but then again the place I went to didn't even look under the truck......
Joe
'01 Didn't have a cat.... at least outside CA they didn't anyway...
makes sense... your '06 didn't come with a DPF... just like the OP's truck didn't come with a CAT
My 97 came with a cat, egr, and a 180 hp engine with the 5 spd, and 14 mpg.. Kommiefornia sucks,
WherEs the big quake when you need it.