Do you mean the pipe between the AFM and the turbo? If so, they're available in silicone from traders on here.
If you mean a cold air box and cold air intake like in the link I gave you on the other thread... why do you need to buy one? Make one! I doubt you'll find much, if anything that's available off the shelf that looks like what I made.
A forum community dedicated to Nissan Skyline owners and enthusiasts. Come join the discussion about performance, turbos, racing, parts, classifieds, modifications, troubleshooting, maintenance, and more!