[Z3->WRX->335]

Not trying to add more fuel to the fire so I will bite my tongue and not give my opinion on a lot of these mods...plus everyone covered most of the things I noticed.

My old tuner and person who built my Subaru motor brought up a valid point when it comes to gauges. (keep in mind he sold plenty of pillar/dash mounted gauge set-ups to other "enthusiasts") he said "I don't run gauges in my personal car, it clutters up the interior and by the time you notice something is wrong, it's usually too late. If you want to keep an eye on your engine, do periodic data-logging. It's more accurate and safer too."