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To start with, these cars have four cylinder inline engines, there's no way they can mount more than a single (as in one) header, so forget the "headers" stuff. Regarding an upgraded "S"-pipe, the only respectable upgrade I'm aware of is the Weapon-R; however, it provides very little beyond the OE pipe, and so unless you have a particular need, I suggest ignoring it. Installing a header will boost power and result in more sound when accelerating. (It'll also eliminate your pre-cat!)
 
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