It should be definitely worth it... your '03 has 4 cats... one on each header, and then one on each midpipe. If you put on the headers you speak of, you'll be getting rid of 2 of the cats, not to mention the aftermarket headers flow better than the oem exhaust manifolds.
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http://farm4.static.flickr.com/3420/...90927559_o.jpg
Some stuff for sale: M030 S 24mm front sway bar, M030 base 19.6mm rear sway bar, 996 GT3 OEM Porsche Motorsport front strut mounts monoball "camber plates"
WTB: looking for some 5-7mm spacers with extended bolts
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