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Discussion Starter #1 (Edited)

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Okay, so I've decided to get a Magnaflow street muffler like http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=9257 or http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=9259

Originally, I wanted to go 2.5" after the flex (2.25" now), but after looking at every Magnaflow muffler, they all have a 2.25" inlet and a 2.5" core.

My question is, does pipe size even matter? I mean, it's only a quarter of an inch.
PS: It's a 99 9-5 2.3t 4-cyl
the bigger the exhaust = the more heat can dissipate off the manifold = easier on the engine/pistons, etc = more the engine/turbo can breathe

or so my full 3" JT exhaust says. :cheesy:
 
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