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exactly on S4 n/a u can remove the air pump (just get a couble alt pulley so u can run two belts
remove:
egr valve
acv
rats nest
bac valve (or I did atleast)
cats (u said already done)
remove the pulsation dampner and do the banjo bolt mod
check your omp tubes and make sure they are good or remove and block off the omp
and premix
make sure u have intake gaskets on hand (Mazda, myself or Atkins can help u with those)
get some vac hose (good time to replace all vac hoses to silicone) ebay or myself can help with that.
could be more but those are a good start.
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