exactly, it's all in what you like for sound. i have the dynomax muffler of the same type. you also have to decide whether or not you want to get an entire cat back system installed or not. i went with 2.5" piping from the catalytic converter (the round piece towards the front) to the back. lots of guys have 2.5" piping on their aleros. you just have to match the piping size to the inlet size on the muffler. and match the tip size to the muffler outlet size.
if you have any other questions, don't hesitate to ask.
and, i have a white rear bumper cut-out for duals if you wanted to buy one already professionally cut. just wanted to put that out there.
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