URD Pipe Bomb question.

http://www.tacomaworld.com/forum/technical-chat/90490-urd-thorly-pipe-bomb-y-pipe-question.html
Posted in the tech section not much traction, so let's try here.

Quick version; I picked up a lightly used URD Pipe Bomb with the two resonators replacing the rear cats.

I understand I need the O2 sim. setup from URD.
Since I still have the front cats and the sensor is after the fronts how does it know if the rear cats are gone with out a sensor after the rear cats?

 

X3, you don't need the o2 sim for the doug thorely pipe bomb.

 

COOL!!!.
I will try it with the stock catback, then the TRD I had on my 09 I kept for the 10, and perhaps the Banks my kid fell in love with when he bought my 09 just to see how loud it will get.

Is it just me or is the 4 wheel drive a lot slower than the 2 wheel?
I know it weighs more and has all the 4X4 drive gear but man it seems a bunch slower.
I will have to get the kid to run next to me and see.

Thanks a bunch fellas I have a bunch of mods to finish transfering to the new one