I'd like to see how you make it fit into you 126, as I'm completely happy with my intercooler setup. I've been kicking around the idea of an air-water setup, as the 126 doesn't seem to have any truly good locations for an intercooler... You may have space in the bumper, I wouldn't know because I've had a Euro bumper for 4 years now, Not sure the space available in the US spec bumper. I'll be fallowing your build.