Only have done cat back so far. Had Borla s type installed because factory is lame. Dropped custom 3 in. x pipe in to rid myself of those valves and suitcase. Highway mileage I get with MDS tuned off is 21 mpg. There was drone in certain RPMs on highway so had some custom j pipes added and now I'm happy with sound, until I decide to put Kooks headers on.
Injen CAI, Fastman ported 85mm TB, Kooks full exhaust, Jet 180 Tstat
0-60 best 4.0 sec