The muffler i currently have is 18" Magnaflow that came with the kit. I love the way it sounds at WOT. I'm getting some drone and i'm looking to quiet it down a bit with a family on the way. I was thinking of replacing the current 18" Magnaflow with a 24" Magnaflow of the same size and swaping them out. Do you think there will be a noticeable difference? I already put a resonator before the muffler that got rid of considerable drone, but looking for a bit more.

 

it should quiet it down a bit more

 

+1. I doubt that there will be a HUGE difference, but it should be somewhat quieter