Exhaust/Test Pipe Questions

[kk2002s]

I used Circuit Werks delete pipes with stock muffler. Very reasonable $$$
I like the sublet increase in exhaust note both accelerating and deceleration. I really like the weight savings. It fit without issue. Getting the 3 flange bolts off is hard work
I'm having an incomplete Secondary Air Monitor and I hope it isn't because of the different flow after the first cat. effecting the 2nd O2 sensor