You don't void your Manufacturer warranty on the entire vehicle by making an unapproved modification to the vehicle. What you do is to limit your warranty cover on any component that fails or is damaged as a consequence of you making that modification.
Read the terms of your Holden warranty you will find in the service book. It includes a statement along these lines...............
" The Voluntary warranty does not cover damage caused by :
(e) alteration or modifications of the vehicle by anyone not authorised by Holden
(f) fitting of parts or accessories not recommended by Holden."
The operative and critical words here being "does not cover damage caused by ".
Since you have paid a lot of money for the MRC damper system I would be cautious.
In the US, Eibach has developed a lowered spring specifically for a MRC equipped Camaro SS which drops the vehicle a fraction over 1 inch. They also have lowered spring kits for Camaros without the MRC option, ie cars fitted with the standard shocks and struts. These lesser kits are definitely not designed for MRC vehicles.
GM has done the same. They offer upgraded suspension packs with lowered springs you can buy off the shelf for your Camaro with the standard suspension but these are not designed for the MRC cars. They have a separate retail suspension package specifically designed for the MRC cars which includes upgraded springs designed to work with the MRC but I don't know if it is actually a lower spring.
Eibach offers springs kits here in OZ specifically for VE and VF commodores but from what I have seen these are specifically denoted as applicable only for standard suspension commodores - not MRC equipped cars. So I would check with them to see if they have anything they could offer you for your MRC equipped car and what comments they have on fitting one of their non MRC lowered spring kits to an MRC equipped commodore.
I assume the ECU for the MRC system has been calibrated based on the amount of suspension travel allowed with the stock spring as well as the spring rate. How that electronic system system then reacts when you put in a lower spring which typically will also have a higher spring rate, and when the piston in the dampers will sit in a different position from stock, I guess is one of the questions.
As for Walkinshaw, at one stage they had a lowering kit for VE series HSV vehicles they claimed worked with MRC equipped HSVs entitled - " WP MRC Suspension lowering Kit ". Looks like nothing like this is currently offered any longer - just spring kits for vehicles without the MRC suspension.
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