Leave it stock. There is not a big difference with a performance exhaust alone and if you do not want to change the sound than your better leaving it as is. BMW stock exhaust is pretty good as is.
in that case, where can i get a stock stainless steel muffler? if i have to keep it stock, i want it to be shiny .. haha, the muffler i have now is way too loud and annoying.. so yeah
Try this place, they are based in wales, but I think they export. Stainless steel exhaust, they can set the sound to how you want it to sound and they are garanteed for life.
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