What’s the pipe size of the cat back on an xB vs. a tC. I was thinking of using the Catalytic from the tC to run it on my turbo xB custom down pipe set up, what do guys think.............. What im tiring to avoid is getting a Check engine light due to the OBD2

 

for the xA/xB stock size is 1.75" catback... precat is like either 2.25" or 2.5"