How much does the system weigh relative to the stock headers & exhaust? Any hp increase from a dyno? I'm also kind of an anti-mod guy. Most of the stuff just adds weight without aby real performance benefit, e.g. wings and things in particular. And weight is the real enemy!

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'07 CS, Meteor Grey, stone grey, 19" Carrera Sport with meteor grey spokes/polished rim, headrest crests, bi-xenons, Bose, power seats, rain sensor, fire extinguisher, heated seats, dimming mirrors, FabSpeed Maxflo II catback
'06 CLS 500, white, beige
'04 Black Ranger Edge