possibly not the most preferable option for having a turbo manifold (most likely due to cheap build quality), but d-series manifolds are readily available off ebay.. haha, you could have the ebay tuned integra!~

http://cgi.ebay.com.au/SS304-HONDA-D...QQcmdZViewItem

if you go down this option, you'll use a t25/28 turbo, which are fairly common in s14/s15 stock turbo's, so you should be able to pick up a 2nd hand one in relatively good condition.

good luck dude, as one of the few g1 aussie tegers, i want to see this happen so bad, cos i'll never get around to doing it myself