SO I WONT NEED NEW CAT BACK THEN CAUSE I WAS TOLD I DIDNT NEED TO REPLACE THAT EITHER.JUST GET THE H PIPE AND IT SHOULD FIT? HOW HARD ID THE INSTALL FOR IT. I ALWAYS TRY TO DO EVERYTHING MY SELF TO SAVE MONEY? IS THERE ANYTHING ELSE I WILL NEED TO BUY BESIDES THE HEADERS AND THE H PIPE?