J-Tubes Stainless Steel Type 1 25/30 hpJ Tubes 25 30hp, Stainless Steel For use with Vintage Speed exhausts only, unless flange modification., Sold per pair These J tubes are an alternative for the already existing metallic J tubes and they can be used to replace the heat exchangers. We give you the opportunity to compose the exhaust yourselves and therefore we have both systems available. One with standard clips and another model with fixed flanges. The J tubes are delivered a pair, seals