What's needed for stage 2 revo

[quattro rob]

was wondering wat i need to go revo stage 2
i already got

-forge tip
-forge cold side
-forge spitter valve
-green panle filter
-smoothed airbox
-better cold feed to air box
-j n75
-fmc fitted this weekend

i know i will need a down pipe, sports cat/decat, better exhaust. is there any thing else i need as i wanting it stage 2 by the new year so i can get saying for my big turbo
thanks in advance

 

[voorhees]

http://www.revotechnik.com/products/softwareProduct.aspx?pvID=342

 

[S3KO4]

FMIC