i actually attempted it today (without removing the turbo). You first have to remove the 02 sensor bracket and unplug the o2 sensor. Next remove the exhaust manifold and turbo heat shields. The top 3 bolts of the dump pipe can be removed from the engine bay by creative use of extensions, swivel sockets and open-ended wrenches. The bottom two were actually missing on my car, but im pretty sure you can manage to loosen em with a small open-ended wrench.
The install was a b#itch. The dump pipe i got was horribly-made, so i could only put 2 of the 5 bolts on...the pipe didnt sit flush, the bolts couldnt be put back on since the piping was in the way, and the stock bolts were too long for the flange. Ive also heard that the 2 bottom bolts are nearly impossible to put back on depending on the pipe. I gave up and put the stock one back on.
One more piece of advice: If youre installing a dump pipe and front pipe, install the dump pipe first instead of installing them as one unit. Its alot easier this way.
Hopefully ur install goes well unlike mine.