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I did the full system on mine using a pair of drive up ramps only. If you can only raise one half of the car at a time then do the back first, remove centre and backbox, then you can still drive it off the ramps and forwards back on to do the front end bits.
I done it the wrong way around and had to refit the intercooler after removing the top downpipe bolts to be able to move the car so it took longer than it should have done.