I have some pics of the job I did on my R33 here if anyone is interested.
The final configuration has changed a little since the pictures were taken but you get the general idea.
My advice is to use T-Bolt hose clamps not the crap ones with the hex head/flathead fastener, as I had some teething problems using the cheaper ones, where they would blow off the piping under high boost conditions (not much fun and rather embarassing when you're hard up it on a mountain run or halfway down the track at Willowbank :Oops: )
In the pictures shown here I have used a 2.5" donut for the 180 and 90 degree bends, but there isn't really enough "meat" left after the bend to clamp the silicone hose to, which is probably part of the reason the piping was blowing off.
For the final incarnation I used the 180 degree bend shown in the picture and took it to an exhaust shop and had them weld an extra few inches onto each end so I had more straight pipe to clamp the silicone hose to. The 90 degree bends I swapped for proper prefabricated ones which have a decent amount of straight pipe on either side of the bend, again, to get more clamping area.
The next door neighbour is getting a welder in the next couple of weeks, so like Dan, I am going to weld a couple of the joins shortly and then maybe get the pipes powdercoated.
Excuse the pic size.....still haven't worked out the thumbnail thing