Putting a fart can on stock piping is just retarded. If you are looking for performance, get a full catback system, which will sound better, look better and perform better. It sounds like you just want the noise, so more power to you but don't expect anything more than noise.

I really suggest doing it right the first time and either get an exhaust shop to make you some thicker piping and weld the muffler on or invest in a full catback.