ah, I see. sorry dude, I thought you were following my guide.
the way I've shown in my guide will work perfectly on a golf, with or without a map sensor.. you simply use the map pipe in place of the 4'' joiner I user behind the headlight.
You're missing a 90 degree bend from that arrangement, that's why it won't work.
Don't get a 135, get another 90 in alloy, turn the 45 off the cooler down further, then insert the alloy 90 point upwards, and it'll connect into the upper 90 shown in the picture just fine.
Are you also using a smaller core?