i have a prochamber with spintech prostreets with it and i wasnt a little louder and deeper sound and im looking at original 40 series or mac flow path wich would be the better one to get
if you want louder and deeper get a catback like magnapack, but if you want the ones your choosing from i would go with the mac flowpaths for louder and deeper, the 40's are just loud they are not really deep.