Guyz ive already have a fireball muffler... my car still have the cat converter and the resonator.... Sbi ng gumagawa ng muffler kung papalitan ko daw ng tig 18 inches ung resonator ko eh mas mgiging buo daw ung 2nog... 22o ba ito??? may gains kaya akong mkukuha kung i upgrade ko ng 18 inches resonator ko...