Getting parts is a PITA.
IC resonator delete, easy enough to find the right length off eBay.
MAC valve, eBay, make sure you get the right model/voltage.
FMIC - easy
FMIC piping - PITA
Exhaust - 2.5" stainless at any good shop, get a magnaflow straight through, sounds great.
Air intake - I've tried a few different setups, sizes, my favourite is a huge AEM dry flow cone filter into the stock intake pipe. Sounds good without sounding like a vacuum cleaner. The big 3" or 3.5" intake are way too loud for my liking.
Bought catch cans, yet to install them. Haven't found right size barbs or hose yet.
Have ordered stage 0+ from Tork.
Yet to do anything else...