[Merged:] Straight pipe?

[paulopel]

My friend is asking, Is it ok kung naka Tanabe Exhaust ka na, naka resonator pa rin ung gitna? or dapat palitan na ung pipe sa gitna? kung ang laki ng muffler is 2.5 inch tapos ung resonator is 1.3 inch, kailangan ba same size or mas malaki ung pipe sa gitna? how long does it take to be changed to stainless straight pipe? how much is it? thanks