i have a 2003 s4 avant which has an aftermarket performance exhaust (milltek)
on the stock exhaust there are two actuators one on each side with two vacuum pipes
the aftermarket exhaust does not have these on
does anyone know what these actuators or vacuum pipes actually do i am unsure whther or not to leave them open to air or whether or not to seal them up or worse case scenario actaully have the valves welded
onto the aftermarket exhaust
the car seems to struggle a little just before 2000 rpm in top gear if i leave the vaccuum pipe open
but if i close them off i get loads of error messages in vag com for both brakes and engine
any help appreciated
on the stock exhaust there are two actuators one on each side with two vacuum pipes
the aftermarket exhaust does not have these on
does anyone know what these actuators or vacuum pipes actually do i am unsure whther or not to leave them open to air or whether or not to seal them up or worse case scenario actaully have the valves welded
onto the aftermarket exhaust
the car seems to struggle a little just before 2000 rpm in top gear if i leave the vaccuum pipe open
but if i close them off i get loads of error messages in vag com for both brakes and engine
any help appreciated