got a 2.7T. thinking of just makin a "test pipe" complete exhaust w/ no cats. will it be a real headache dealing w/ the O2 signals if they are not actually installed in cats?

could re-flash software take no cats into consideration(w/ out running in a closed loop program like the stock ecu in safe mode)?

p.s. -what's the loudest BOV i can put on my car? Just kiddin guys!!haha

 

I know people who have used these for the downstream o2 sensors with success.
http://www.vexmotorsports.com/T1R-O2...or_p_1304.html

...or you can make some.

http://forums.audiworld.com/s4/msgs/2239514.phtml