These Australian-made intakes are hands-down the nicest aftermarket intakes available for the G8 when it comes to fit and finish. They fit so well that they are often mistaken for a factory piece.
Looks aside, they also offer some of the best horsepower gains. In this video made by a shop in New Zealand, they were able to make an additional 29.5 crank HP over the factory intake and 55 crank HP with a tune. This was on a Holden Commodore (Australian version of the G8) with a full exhaust. OTR style intakes offer better horsepower gains because they provide a straight shot into the intake with no bends, they benefit from a ram-air effect, and they feed cooler air in from in front of the radiator.
These are also available as a complete kit including the side panels and infill panel to cover the gap left after the removal of the factory intake:
Pricing is $549 with free US shipping for the basic kit, and $649 for the complete kit including the side panels and infill panel. We also have couplers for MAF-less setups and Magnuson superchargers available.
You can use this intake with a 102mm throttle body and 4" MAF housing by replacing the MAF to TB coupler with a 4" coupler.
These intakes can be purchased on our website here: http://www.improvedracing.com/products/intakes-c-48.html
You can also call us at 407-494-3278 to place an order, or post up or PM me if you have any questions. We are happy to help.
Thanks!
Michael @ Improved