I just installed the megan resonated test pipes....
after second day of over an hour driving it threw a code. I noticed where the sensor is screwed in, the threadlet was kinda deep so that the o2 sensor isnt in as far into the exhaust. I know this is done to avoid throwing a cell but in this case it did not work. There is a little bit of rasp just under 3k rpm but the rest of it sounds sweet!
I have headers with megan resonated pipes, the rest of exhaust is stock. sounds like stock with a little deeper tone up to just under 3k rpm where the crackle sound is heard. when you hit 3k it pretty much goes away and at 5k-6k rpm its screaming, sounds awsome!!!