Hello new to this board and I just purchased a 2004 645ci and would like to get a more aggressive exhaust note. My initial research hasnít unearthed many exhaust/muffler options. I would like to replace the mufflers and do it with out spending a fortune. Has anybody got some ideas or experiences that they would like share. I saw on one BMW form something about magnaflows mufflers. Any suggestions would be greatly appreciated