by tree » Thu Mar 29, 2012 4:48 pm
a re-map isnt required but im not a fan of VTA dump valves. (one staht make tssssh noise) recirc dump valves are better IMO. Air that has been registered by the MAF is being vented to atmosphere with a VTA dump valve. a recirc will reintroduce the vented air back into the intake system.
Some people report erratic idles and running issues after having fitted soem dump valves, others have had no issues what so ever.
Quocunque jeceris stabit