As Alex said they make a good doorstop.

Get a real ecu if you want more power & then you can get a real tune.... Rather than being confined by the lies the piggyback can tell your factory ECU (which is generally just modifying the MAF signal to add more fuel).

PowerFC
Vipec
Link

They are then best bang for buck ECU's for your GC8.

__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]