My dad told me all the diff ways to describe noise to mechanics so I wouldnt look stupid, but I forgot them, so I'll just describe the best I can. I have 57000 miles on my car. It has seen many 6000rpm revs(prev owner) w/ everything stock internally. It has Poston headers and downpipe. when I'm just idling/cruizing its not very loud, but when I accelerate, the clatter gets real noisy. I think it might be worn out valve springs, but could it be just noisy headers...I've checked for exhaust leaks thouoghly.