i have a 1990 integra da9 with b18 motor non vtec, i have a full extractors back exhaust system and it doesnt sound very good it has a very raspy sound especially when its cold, some say i should get a bigger resonator to fix it, one of my friends has a vtir prelude with cat back system and has same problem. any help greatly appreciated!!!

specs:

headers are 4-2-1 design: 42MM-48MM-60MM.

piping is 60mm with a single 12'' resonator.

brand is xforce a leading brand in australia

 

do you have a cat?

 

yes 12 inch