exhaust system!!

hi all HAPPY NEW YEARS!!!! well a beginning of a new year and the next thing you know it's SUMMER TIME BABY well anyways to the topic what exhaust system would you recommend?!?! apexi greddy ??? need help and one more thing if anybody remember me from the last threads i was askin about why does my car jerk so bad when i floor it maybe i decribed it wrong it doesn't jerk it just makes this nasty noise from the front and it's really really loud! And about balancing tires how much is it i think that's why my car tumbles up and down even if i'm on smooth pavement need some answers and suggestions thank you all