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Originally Posted by LetItRev
I received my downpipe today and before I installed it followed up on information I heard regarding uppipe install and needing to pull the downpipe to install the uppipe. (Thus I decided it would be a better thing to do them at the same time). 
I am seeking your experiences and opinions on uppipes.
Flex or no flex?
Install a beyotch? (I love a good challenge and most times can do this stuff provided I have clear instructions).
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What year is your car again? '04+ have no cat in the uppipe which was the biggest reason IMO for doing the swap on the '02 and '03s. You might not want to bother since the OEM pipe fits really well, and has the heat shielding. Remember, the more heat you keep in the exhaust before the turbo, the more thermal expansion there is to spin the turbo!
That said, uppipe installs aren't too bad if you've got good instructions. The biggest thing to do is plan ahead, and know exactly what you're going to need to do so you'll have the proper tools. A O2 sensor socket would really help (I was never able to find one...) and a 14mm angle joint socket and 14mm crow's foot socket are clutch. Patience and Liquid Wrench are your new best friends. Make sure eveything's nice and cooled off, then soak all the bolts you'll need to remove in LW and wait. Take your time so you don't strip any nuts or shear any studs.