Well in my car with the header, apexi-N1 single and stock second cat it sounds nice. With gutted first cat 16ga 2.5" SS test pipe in place of second cat and N1, It sounded nice too, almost the same tone as now.
BUT header, 2.5" SS test pipe, and N1 its rather raspy, loud and well, reminds me of a loud honda. I attribute this to the thin gauge of the header, and the thin gauge of the SS test pipe (used to make them a year or 2 back). It sounded good all gutted and with a test pipe because the manifold was cast and thick, along with the pre cat (in my case), and the only thin part was the test pipe. With the thinness of both the pipe and header it allows alot of resonances and noise to protrude.
Just not my taste in sound. I can assure you when I dump the header for a t3/t40e, manifold and down pipe, my cat will come off again and in will go my t316 SS 3" test pipe that I have been saving for a long time
Also possibly wrapping the test pipe with fiberglass header wrap would remove alot of these resonances rudcing the sound of raspyness, I would imagine.