I just had a weekend like that too. Just fitted a front mounted intercooler to my sister's Impreza and spent Friday making sure we had everything so we didn't run into any problems......

1st problem the intercooler core pipes didn't fit, different diameter.....I had to wait for a mate to bring me over some replacement hose that was the right size

2nd problem the replacement brake master cylinder we had to change was different so we had to put the old one back on.

Why do we bother?