I have put on a cherry bomb cat back exhaust. and it started to knock against the rear end the other day while at idle. thin i ready the thread about possibly the knock sensers thinking the exhaust knocking against the rear axle and maybe causing the timing to advancing. i am moving the exhaust, it came loose, so it will not knock against the rear end this weekend. just wanted to see if the timing was advanced per the reading on the torque app. i am going out to check in a few mins. i ll let you know what i find out. thanks for the response.
