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Originally Posted by The Radium King
i think that any of the aftermarket headers that will fit a 2001 will fit your car. they typically come in two versions: with and without cats. also, any of the aftermarket midpipes will fit your car: again with and without cats.
the difference between oem euro and oem us is that oem euro does not have cats on the headers, only the mid pipes. oem us has cats on both (stricter emmissions).
us cars monitor the presence of cats in the system by putting an o2 sensor after the cats on the headers. euro cars do not monitor this at all, so theoretically you could run without any cats. the reduction in back pressue you get by doing this is said to increase top end power but reduce mid-range torque a wee bit.
there are cheap headers on the market ($100-ish); check ebay. there are NO cheap midpipes on the market; the only makers i can find are stebro, nhp and fabspeed ($500 for a straight pipe, more if you want cats in it).
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There lies the most important question - are you saying that the US 2001 (with cat on headers) and the Euro 2001 (without cat on headers) have the same size headers, at least for fitment and length ?
I'm actually more interested in sports 200 cel cats on the midpipes, but until I know whether the US and euro headers are the same fitment and length, I'm not confident of ordering the sports cats mid pipe (which are meant for US 2001 models).