I just got my ZEX nitrous kit on my 96' GT. Now I wanna go to a 125 shot, what can I use to retard my timing?  I've already got the bigger fuel pump.  Which programmer will RETARD my timing to what I want it set at?  Is the timing adjuster worth getting. The speed shops around here have never heard of a timing adjuster for the 4.6.  But I see them for sale in catalogs. Are they hard to put on?  Is SCT LIVEWIRE an option?