So many brands! Essentially, mufflers all do the same thing. However, all have different characteristics - some make your car less noisy, some give you more HP. I prefer golden middle and would like to get one moderately noisy without sacrificing the power (I have a 4cyl 318i). What is the best deal for me, and how much would I expect to pay? Suggestions on specific brand and/or website to order from would be appreciated. On carparts.com I found around 120 different mufflers fit for my vehicle - makes me dizzy... :huh: