whitehendrix- That epoxy mod sounds interesting. I'll have to look at what they did. We are working with a few people to develope these lighter components and they "will not" shatter. Reducing the A/R will reduce your top end, depending if your turbo is at its efficeny range.
A few companies are...
As for all that have posted regarding this. We have calculated the costs at producing these. They will still have to be fully tested, but the prototypes will be completed in 3-4 weeks minus holidays. The mass reduction would make it a little more then a third of its original mass. Will it work...
The cost would be skyrocketing. But I wouldn't mind doing some r&d on this. I have access to basically any material and the machinery to make it happen. Although it would be an extreme cost to do this. I still haven't got all the cost number done yet but I maybe able to do some testing on this.
My background is limited in regards to automotive. I've been around and delt with several vehicles that have been plagued by turbo lag. I've wondered if there was a effective way to increase the velocities of the exhuast gas to increase spooling properties. Like on some of your twin scrolls...