I was just browsing through some of the blogs I visit on a daily basis. One of them pointed me to a new website called HKS TV, It's some sort of HKS version of youtube. You can find all sorts of cool video's, from product reviews to onboard Time Attack video's of the HKS CT230R. Although everything is in Japanese you still get a good understanding for all things HKS.
I especially like this video where you can see some ‘historic' HKS race cars like the Drag 70 Supra and their Mercedes CLK.
You can check out more video's here http://www.hks-tv.com/watch/