Reasons you need a swap over a supercharger
K24A4 (waterport fixed)
Prb Intake Manifold and Throttlebody
Kpro (or 310 cc injectors)
Ebay Coldair Intake
Energy Suspention Engine Mounts
this all comes to around 1400bu (500 if you dont use kpro) plus the cost of swapping but if you do it yourself then well its free lol. I have done the swap before and its not to hard just a little time consumeing. all the sensors you need will swap over from the k20a3 along with the alternator ac and idle pully.
You can fit up whatever exhaust setup you want to it aswell.
Some people have sway bar clearance issues but not everyone.
On this setup im running around a 14.5-14.7 in the quarter mile which is faster then superchaged A3's
this is fun as shit to drive onthe streets and i love it because i still get good gas milage 28city 36 highway
any other question you may have about the set up let me know and ill be happy to tell you what i know.