im driving a satria 1.3gli.is it ok if i change my whole set exhaust to full set gti exhaust?extractor,mid bullet n rear box n all?does it improves power or anything?is it practical?wuts the diameter of the gti piping?is it 1.8"?does it have any benefit changing to gti exhaust?i dont want it too loud.mayb a bit bassy will do.newbie ere.thanx 
