It is most noticable when the engine is cold and the revs are choked for the warmup. I guess I never really paid attention to it untill I brought it in for the air bag recall and was told I had an exhaust leak. I retightened the header bolts and the exhaust bolts. The muffler is undersized but with the raido and A/C off I can notice mild ping on idle and for sure on cold starts.
