Cheapest/easiest option is to fit a 5th injector, this will take a lot of the strain off the metering unit and give you a small amount of fuel mapping control.
ie: Metering unit fuels for up to say 12psi (random figure) and then 5th injector provides mapable fuelling for anything over that.
Last edited by Karlos G; Apr 25, 2009 at 09:10 AM.