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So for the 135i, you need to run meth to get you close to 400 whp and a really good tune. i would look at PTF (Pro Tuning Freaks), iv read they have done great work, however dont take my word for it do some research on them. Depending on how many kms are on your motor you might want to walnut blast the valves first before running meth, but the Meth will really help get you to 400 Whp. iv read that you can get 400whp on a n54 135i with just the JB4.
As for the n55 between the E series and the F series, i believe that there isnt much of a change between the two, however the aftermarket and tuning availability for the F series is very limited at the moment so you cant really do much.
Again this is from what i read and understand, so just keep reading.
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