My understanding is that as the cats are in the cans on a Roadster, changing the pipes out will eliminate the cats. What you have is an empty cat box in the middle, sometimes called a pong box (or something), which I understand has some baffling in it to help balance the 2 pipes and provide back pressure. But no cat. However, Staintune make a freer flowing cross over pipe which is a 2 pipe version of the 3 pipe cat eliminator needed on pre-Roadster models.

And yes, Dave's right, you can't fit the 3 pipe system to a Roadster because of the ABS. Well I think that's right anyway.
 
Anyone know if a cat eliminator pipe is avalable for 2012 Roadster

Yep, cat eliminator are the TORS.
CanerraR3 is right cat is in the can both sides.
I'm putting a three into one system on my roadster.:D
 
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