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^ I have the IPD plenum along with I think the 997/ Cayenne throttle body. It causes you to re-route the shifter cable if you have a manual transmission. It turns a simple modification into an "OMG WHY?!" sort of ordeal, but it all DOES fit if you work through it.
A highly recommended tool if you are DIY is a throttle cable ball/cup screwdriver pry tool thing. I got it from a place that sells Mercedes Benz tools, and is the only thing that I found to reliably and repeatedly remove the cup from the throttle link ball with no damage to anything. Also the shift link adjustable rod on the Numeric racing site is fantastic. All metal, and replaces the all plastic link that comes stock. You can also adjust out all of the slop that occurs in the fore/aft shift plane.
My "S" came factory stock with custom headers, so I left them on and went with a Borla cat-back muffler system. I actually do not recommend them. I had to do quite a bit of cutting, test fitting, bending, re-fitting, etc etc until everything fit as well as I could without a hydraulic pipe bender. It sounds great though. Looks great too.
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