[mag300cSTL]

I would go with the MAGNAFLOW exhaust..i had one of their systems on my WRX and it was a high quality piece..my borla header on the WRX was a POS that kept developing cracks, etc..PLUS borla didnt back it up..so much for their million mile warranty...FLowmasters in my opinion are TOO loud unless u get the 3 chamber ones..but the ones bein sold as a kit for the 300c are two chamber and have too much flowmaster droning goin on...id go witht he dynatech headers with hi flo cat and the magnaflow exhaust kit