All, I have been looking for a solution to my plennum to cowl connection for the last few years. I Have tried several materials including the rubber from an inner tube and nothing has worked right. I had a few bands made out of neoprene material from a surf shop in CA. They are 2" wide and tight fitting. My gap between the plennum inlets and cowl is about 1/8 ". So far they are working great. They were $5 each to have made a nice connection. I should have done that 2 years ago. FWIW... Randy L. Snarr N694RS 235/320 99.999% complete