Tip size can affect the sound.

what you all mean when you say DROAN and LUKE tell us how the tip makes a diff. whats the diff. sizes do I ask bec. i am going to an exspandit 5 inch back no muff. and i want it loud and deep sounding but i wanna put a 6inch tip on it

In my opinion the larger the tip the deeper the sound. a 5" straight piped with a 6" tip will sound very nice. Only way to get louder would be stacks.

thats cool then I wish i had the money for the bullydog 6ich system turbo back

To many fitment issues with the 6"

well thats good to knowno one ever mintioned that lol thanks