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I have a 2011 135i, but I assume the engine is identical. If it's built before 1/1/2011 it requires bottom-mount injectors. Built after 1/1/2011 it uses top-mount injectors. FCPEuro doesn't take this build date difference into account so it'll show that both versions fit, but that's not true. RealOEM will list the correct part numbers for the respective build date. Another important note is that these two versions of injectors require DIFFERENT injector removal tools. FCPEuro doesn't even sell the correct tool for build dates prior to 1/1/2011. If you need more info on part numbers I can dig them up.
I didn't compress anything when I installed my injectors, but I did install using the injector removal tool according to the instructions on newtis.info. N55 injectors definitely aren't the same as N54 and if you do a search online for injector installation you'll only find N54... newtis.info was the only place I found with the correct info for N55.
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