The butt Dyno feels great duratec usually see 15-20whp with full headers and exhaust. The sound is quieter then the fswerks race system still. No drone at any speed while cruising it sounds like my car doesn't even have exhaust. My system could be considered a 2.5" stealth system.
2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq