Access will be the biggest PITA here, it looks a tight squeeze but with the right tools (and grazed knuckles) you might just be able to do it. See the picture for the fastener positions. The brackets will be rusting away on older cars so you might find the intercooler just hanging from the upper part of the bracket. My 147 is an 08 plate and as you can see the bottom of the bracket is badly corroded. The 156 has a different bumper etc but the process should be similar.Not according to eLearn, top and bottom engine covers, battery and tray and air cleaner element (which may include the housing too) no mention of the bumper.