If you went with a catless Down pipe then you need to get the Permanent DP Fix (Simulates the cat for the car so it doesn't toss the readiness error code).
You will not be able to pass emissions test without the Permanent DP Fix. While you are at it, might as well get the JB4 at the same time to put the catless DP to good use (The install is in the same location)
JB4 Install Guide: http://www.burgertuning.com/instructions/JB4PnP.pdf
Permanent DP Fix: http://www.burgertuning.com/dpfix.html
DP Fix install guide: http://burgertuning.com/instructions/BMSdownpipefix.pdf