We just put dual 2.5 inch exhaust on my 98 ram with 5.2 motor last Thursday and all I did was put the existing sensors back in the new pipes. A week later and no codes yet, runs and drives great just like I knew it would. Did the same type of setup to my 99 ram I had back in 2005 and it was same deal, never had any problems with it. I don't see why you'd need simulators. That's nice that the dodges don't need them.  Every Chevy truck I've had needed sims or the PCM tuned to turn the SES light off after removing the cats.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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