Originally Posted by m5james

I would think the x-pipe would add the most noise, while the mufflers might allow more of the poppyness sound come from the exhaust...but then again that's just a guess. I'd imagine the x-pipe would be cheaper installation wise vs custom welding and hanging two mufflers. When I did my hitch installation on the X, I polished and masked the tips before painting the muffler black so they'd look better in there.

I did the dual Magnaflows on the 7 just because it looks sick having dual mufflers and big tips sticking out of the bumper vs the stock ugly turned down tips it came with. Below are pics of Ferrari Steve's and couple other Bimmerboard members exhaust after Steve and I created a PDF with instructions, templates and all.