A heat exchanger for cooling a gas using a liquid coolant, said heat exchanger comprising: a plurality of finned heat exchange tubes arranged substantially parallel to each other, in which each finned heat exchange tube comprises, an inner heat exchange tube for exchanging heat between said gas and said liquid coolant, each inner heat exchange tube having an inner surface and an outer surface, wherein a portion of said gas flows through the inner heat exchange tube, each finned heat exchange tube further comprising a plurality of fins contacting the inner surface of said respective inner heat exchange tube; said plurality of finned heat exchange tubes being collectively surrounded by at least one tubular outer body, said tubular outer body having an inner surface and an outer surface, wherein said liquid coolant flows between the outer surfaces of said inner heat exchange tubes of the plurality of finned heat exchange tubes and the inner surface of said tubular outer body characterized in that: at least one of said plurality of finned heat exchange tubes includes within said at least one finned heat exchange tube: a fin component formed from a single piece of metal, folded such that a first end of the single piece of metal and a second end of the single piece of metal collectively form an outer connecting wall, said outer connecting wall having opposing ends, and a pair of substantially straight fin walls extending radially inwardly from the opposing ends of said outer connecting wall and converging toward an axial centre of said at least one inner heat exchange tube, said first end of the single piece of metal and said second end of the single piece of metal forming a gap positioned within the outer connecting wall. a plurality of finned heat exchange tubes arranged substantially parallel to each other, in which each finned heat exchange tube comprises, an inner heat exchange tube for exchanging heat between said gas and said liquid coolant, each inner heat exchange tube having an inner surface and an outer surface, wherein a portion of said gas flows through the inner heat exchange tube, each finned heat exchange tube further comprising a plurality of fins contacting the inner surface of said respective inner heat exchange tube; said plurality of finned heat exchange tubes being collectively surrounded by at least one tubular outer body, said tubular outer body having an inner surface and an outer surface, wherein said liquid coolant flows between the outer surfaces of said inner heat exchange tubes of the plurality of finned heat exchange tubes and the inner surface of said tubular outer body characterized in that: at least one of said plurality of finned heat exchange tubes includes within said at least one finned heat exchange tube: a fin component formed from a single piece of metal, folded such that a first end of the single piece of metal and a second end of the single piece of metal collectively form an outer connecting wall, said outer connecting wall having opposing ends, and a pair of substantially straight fin walls extending radially inwardly from the opposing ends of said outer connecting wall and converging toward an axial centre of said at least one inner heat exchange tube, said first end of the single piece of metal and said second end of the single piece of metal forming a gap positioned within the outer connecting wall. a fin component formed from a single piece of metal, folded such that a first end of the single piece of metal and a second end of the single piece of metal collectively form an outer connecting wall, said outer connecting wall having opposing ends, and a pair of substantially straight fin walls extending radially inwardly from the opposing ends of said outer connecting wall and converging toward an axial centre of said at least one inner heat exchange tube, said first end of the single piece of metal and said second end of the single piece of metal forming a gap positioned within the outer connecting wall.