1987 pontiac firebird?

hi my name is kyle i live in richfield, mn and i was wondering where i can buy performance exhaust for my car? i want the type where it still sounds like it has power... i don't want that quiet stuff! i'm just not sure where i can buy my exhaust and have them install it to... will good year, car x, firestone do this? how much will it cost? any info would be great... thanks for your time