Trick Shift Performance has just announced the release of their own twin throttle body manifold that is a direct bolt on swap for the Holden injected 5-litre engines.
Having a slim line profile, this manifold was specifically designed to fit under the bonnet of VN to VT series 1 Commodores, it can be also custom fitted to VB-VL model Commodores. 

Using the standard OEM fuel fails, the Trick Shift Manifold has twin progressive throttle bodies that allow a substantially amount more air flow than the factory setup. It is made from cast alloy and is also designed to give easy access to the rear mounted distributor, which is very handy for anyone that has ever needed to work on their EFI 5-litre.

Further information is available on their constantly updated website, www.trickshiftperformance.com.au