Has anyone ever used or tried any aftermarket EFI/Timing computers such as the Haltech E6GMX GM Replacement Plug-In Computer or Megasquirt system /

http://www.haltech.com/e6gmx.htm

http://www.bgsoflex.com/megasquirt.html

I know some of the Fiero guys have been using the Haltech box for their 3.4 LQI DOHC and Supercharged 3.8 conversions. Also, some of the guys down and under use them on their Holden'*.

Thanks