MACE SPEED DEMON PACKAGE TO SUIT HOLDEN CALAIS VF SIDI LFX 3.6L V6We understand that copious controversy circulates through the car scene when it comes to modifying the SIDI V6. With most unfortunately agreeing the gains to dollar value are minimal and after all, whats the point of enhancing a V6 when itll never beat and sound like a V8, right? Well, with the extensive research and development we have poured into performance upgrades for the Australian built SIDI V6 motors, we can safely say we now have a unique