i concur.. running race gas and or water meth injection with a decent exhaust and 17psi chip (awe, apr , giac) will get you 300 whp.. and if you do go with k04's why would you not go ahead and push for 400whp?? its not that far off.. if youve got the 2 grand or so for the turbos.. get an exhaust, clutch, intercoolers and fueling..
i do look at it differently.. i do all my labor, so if you go as far as buying turbos and installing them, labor wise everything else is easy..

 

to mod an S4 with K04s will require you to upgrade alot of other ****. you can just spend 2600 bucks for k04s and inlet pipes and think you are gonna have a fast ride. It gets really expensive. Unless you have 12 grand to spend, I would say start saving asap if you wanna upgrade to K04s cuz thats what everything will cost in other upgrades you will need.

 

Not if you go my route it won't be expensive , I got used k04's and inlets for $1900 with a front sub mount and s4 motor mounts, LWFW $250 NEW fadanza, 034 motor mounts track $150, south bend "FE Series" $400, $350 for a 034 maf 85mm housing and green giants, and then $1000 for GIAC stage 3 tune.$310 for down pipes SSAC new. already had cat back and a DTS AWE stabilizer. lookin $4360. Not bad if you ask me a lot more bang for buck if you ask me

 

You certainly did it on a budget! Great job!