High pressure isnt necessarily for returnless. The focus pump and gt pumps from at full voltage as well. Focus pump is 60 PSI at 12V, im sure the GT is the same.. Walbro is 30 PSI @ 12V
Who said high pressure is only for return less?
The Focus SVT and GT40 are return less systems, just like the Speed6. The pump only runs as it's needed, when it's needed.
The Walbro pump ran in a return less system actually runs at a lesser output because of the signal being sent to it. The Focus SVT pump flows more fuel in it's designed system.
If you put on a pump designed for fuel return systems, on a return less system, the pump continues running at it max output and will end up failing prematurely.
Pumps:----(13V)40psi--60psi--80psi-(BAP 17V)40psi--60psi-80psi
5.0 & SN95------98----73----46--------------137----100--63
4.6 2V ('99+)----158---115---65--------------264----201--152
4.6 4V ('99-'02)--154---131--100-------------211----189---162
'03/'04 Cobra(x2)-167---145--119-------------236----215--189
Lightning---------149---127--95--------------204----181--158
Focus Zetec------147---103--54--------------230----190--160
SVT Focus-------217---185---143-------------302----278--244