I have a Draxas header, f2 flex and nothing but a resonator the rest of the way. I LOVE the sound. The drone isn't that bad (if you ask me). The header and flex are 2 1/2 and the MBRP exhaust is 2 1/4. It took a little to get used to the sound, but now I can hardly hear it. Everyone always tells me how loud it is, but it's normal to me.
2012 Focus Sport, STexhaust, COBB Filter, Snorkel delete, Toms Tune
SOLD2006 SAP, Draxas Header, MBRPexhaust, CAI, Tuned, FRPP lowering kit, SVT 5spoke wheels, HaloProjectorHeadlights, Niteshaded Side markers/tails, Mazda rearwiper, mustang antenna