So it appears that the Supertech Valve Spring Kits is not something anyone keeps in stock, and the manufacturer does not have any kits either (I spoke to them last week). Considering it was something that they once made, and they undoubtedly have the capability to produce again, I feel like its just a matter of demand that would trigger the manufacturing of more of these kits.

I personally need a kit as I am on the tail end of an engine build for my C5 RS6 and I don't know what other options exist outside of this kit.

If other folks are interested? I would be happy to take on the task to try and convince Supertech to make a limited run of these assuming we all commit to buying that run of kits from them.

If we dont have the fanfare to do a group-buy and anyone has a bead on a kit that exists on some shelf somewhere, let me know!

To be clear, this is for a 4.2L Biturbo (BCY) engine that came stock with our C5 RS6's.

Cheers,
Sasha