Description Each system is a direct fit to the factory OE exhaust system and comes complete with a fitting kit. These great sounding exhaust systems have a subtle deep tone at idle and nice muted grumble at cruise with none of the dreaded 4 cylinder drone but at WOT they sound incredible! The ERST systems are slightly bigger in bore size and are less restrictive than the standard exhaust therefore are more efficient and help to release approx 10-12% more power!
