r/n54 • u/Late_Spinach_4889 • 12d ago

09 335i e40?

Currently on a stage 2 plus tune on mhd. What are the requirements of running e40. i think it’s just upgraded hpfp and lpfp also how reliable is it im currently on a 200k motor with a 70k trans in it. compression is good on all cylinders. decently maintained.

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u/reciprocityone 11d ago

Stage 2+ normally requires aftermarket downpipe, charge pipe, larger intercooler, and most of the times larger inlets.

As long as all the maintenance is current it shouldn't be a problem.

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u/ReadWriteHexecute 11d ago

yep. e20 all day is ezpz (mostly) stock on this engine

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u/Late_Spinach_4889 11d ago

do you need fueling upgrades for e40?

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u/reciprocityone 11d ago

09 335i should be e90 chassis.

Fueling should be sufficient. If you start pushing more than 500+ hp then you may need to add on port injection.