torn between the two at the mo, is the sound they give off any different to the other (louder, tone)?

build quality wise the forge looks better made, but is this the case with the internals?

they're similar in price but is one 'better' than the other?

would prefer to just bolt on and go, so is there much maintanance to do on either? i've heard of people changing the springs(?) is this necassary in normal driving conditions?

any answers or views would be much appreciated.

ta