Saw this on focusst.org.
This is with the 3" downpipe. Sounds a little much with the DP. Hopefully you'll come with a stealth system with the DP.
2013 Ford Focus BOOS[ST]ED
2010 Ford Focus "S"edan (11 Psi, GT28RS) - Sold
ROTM Nov '11 (2010 Focus S)