I was lucky to find 2 pieces from my vintage VW parts bin that work perfectly. The first piece is a 2" by 24" fresh air hose which appears to be made of a dense paper with a metallic inner lining. These are commonly used on VW cars from the 1960s. A VW of this era uses two 12 inch length hoses but I was lucky to find one that I had not cut in half so it remains 24" in length and was the perfect fit. The second piece is a 2" exhaust coupler that attaches the hose to the intake elbow.
I removed the original intake and flipped the intake elbow backwards and positioned the rear under the battery tray so it faces the rear of the engine. I connected the elbow and hose with the exhaust coupler. I ran the 2 inch hose under the batter tray and placed it between the engine block and exhaust manifold behind the first Cat. It stayed in place by itself and needed no attachment point. I placed a zip lock bag secured with a rubber band over the hole for the resonator. This will allow it to be easily removed when outside temps get too hot to allow for cooler air to be pulled in. I monitor it all with a ScanGauge II.
I like this option because it allows better access to the front of the engine so I can easily remove the oil filter from the top.
I've had this mod installed for a little over 1,000 miles and it has shown no problems with placement or movement. The temps here this time of year have varied between low 40s to high 70s and I am seeing Intake Air Temps from 115 to 125.
I'm sure you could prepare some type of enclosure around the first Cat to produce even warmer temps if you are in a colder climate.
I've attached pictures that I think are self explanatory but feel free to email me should you have any questions.
http://i227.photobucket.com/albums/d...d/IMG_0750.jpg
http://i227.photobucket.com/albums/d...d/IMG_0752.jpg
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http://i227.photobucket.com/albums/d...d/IMG_0749.jpg
http://i227.photobucket.com/albums/d...d/IMG_0760.jpg
