to say a dump wont work right on a s2 is rubbish go and get a electronic box off stu at m.s.d .. works perfect it wires into your ecu but at another point and works off the throttle solanoid . when you take your foot off the gas the solanoid shuts the dump closed ..job done works right so dumps work fine on s2 unlike the frst were you can just slap one on with no electronic box..

andy