Not sure on the spring rates. KWs have progressive springs and talking to John he said the ones they come with are the best suited to my needs anyhow. From all reports they are stiff enough for all but the most serious of racers, and smooth enough for a daily drive on Perths shitty roads. - Interesting note. I asked about these a year ago and got a bit of arude shock with their price. I was about to order from an online retailer and looked at importing from the U.S. , double checked with wheels world again and they are now the cheapest out of the lot!

I don't think I'll be going single scroll anytime soon. I'd love to but have a few other projects soaking up the kesh.

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Twin scroll Pig Bi-Squeeling