http://www.amazon.com/gp/part-finde...w/2004/Ford/Focus/ref=au_pf_dp_lf_ladp_1_3?ie=UTF8&carId=002&partsNode=15713881
Here are a couple options. I have heard great feedback on both systems. Also the FSWerks Stealth and Race systems. Only difference is the stealth has a resonator that drops the volume. If I were you I'd start with an off road pipe from someone like CFM (http://www.c-f-m.com/performancepar...rts/pc/CFM-2-1-2-inch-Polished-Stainless-SVT-Focus-Offroad-Pipe-Kit-128p769.htm) and go from there. The stock exhaust on the SVT is pretty good and an off road pipe will bring the power and tone around to a better level. Also the stock exhaust is stainless so thats a plus. Stock size is 2.25" and most aftermarket is 2.25 or 2.5.

 

Listen to some videos on YouTube.

Sent from my ADR6425LVW using Tapatalk

 

FSWerks would be my recommendation for good sound. I've had the Stealth and now have the Race. If you want a good low sound get the Stealth. If you want your car to sound like you just pulled off a rally course get the Race

 

going bigger no performance stock exhaust is ss why waste your money unless just for sound

 

This ^^^^^^^ is why I suggested starting with an offroad pipe and going from there.