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I have the VRSF 7.5 stepped one in my E84 X1 Msport. I had a shop install it cause I didn't wanna mess up the trimming but I have a friend who installed the same one on his 135i and he said it was a pain. Took him around 4 hours. I love this intercooler it cooled my IAT's way down and makes me feel a lot better about being hard on the car. You would probably be fine with the 5 inch one if u don't plan on upgrading ur turbos though.
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