---Twin core aluminium core will achieve up to 30% more cooling capability than the standard radiator. ---Keeps engine temperatures down, ideal for track use. ---More water volume within a channel means greater cooling efficiency. ---Polished alloy and TIG welded for strength and long lasting durability. ---Designed to be a direct replacement for ease of fitment Compatible with: ---Vauxhall / Opel Astra H MK5 1.3l, 1.7 & 1.9l CDTi 2004-2009 models. ---Vauxhall / Opel Astra H MK5 2.0l petrol turbo VXR 2004-2009 models. ---Vauxhall / Opel Zafira B 1.7l CDTi 2006-2011 models. ---Vauxhall / Opel Zafira B 1.9l CDTi 2005-2011 models. Please Note: Suitable for manual transmission models with/without aircon.