alright im new 2 this but im going to buy either a full cat back or just a muffler for my 98 4door civic. now people are in one ear telling me just get a muffler and people are in the other sayin get a cat back. but then they say a cat back might lose me horse power..then they say a muffler dont do shit 4 my car but make it sound good...will someone please give me an honest opinion on what would be better