Um ... welcome to the board and a couple of things ....
- Search is your friend
- Search > You (at the moment)
- There are several threads that debate this topic ad nauseam
But to answer your question these are your options in random order:
- GTM Stage 1 SC
- GTM Stage 1.5 SC
- GTM Stage 2 SC
- GTM Twin SC
- Stillen SC
- Custom SC kit from the best tuner shop
Your personal preference on which one is
best.