3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
K&N is a good bet. they advertise to give you 22hp(or was that 20% increase in power). But... you have to be religous in cleaning it regularly- they get filthy dirty fast because of the oil recharge.
Am sure the rest of the gang will want to put in their say on this. Personally, i will stick with the stock air filters- am kinda' lazy u see, don't wanna mess with having to clean every now and then ;-)
i.e. K&N-gotta clean every 2000milesor less + oil recharge; whereas, stock air filter-change filter every 5-6,000 miles (no frills no mess)
I just ordered a few days ago AFe s1 cai and shark injector from turnermotorsports. From what i've heard from other 330i guys is that AFe S1 has been known to be one of the best intakes, a lil pricey but not as pricey as GruppeM intake. GruppeM intake i'd say would be the best performance and most best sounding but it's not cheap hehe.
But if you're going to do a any type of intake system on your 330i bimmer i'd suggest getting at least shark injector or AA software. Got a friend in town that i ran a few times, i'd win slightly everytime until he got his shark injector and his AFe S1 lol... but it'll change very soon.. haha
I have a cheap ebay intake on my '95 325i, just an aluminum intake pipe and a cone filter, and the it sounds good, it adds an extra audible sort of growling howl under acceleration. (okay it is hard to describe what it sounds like) but there is only a sound when under acceleration, and it really sounds good. Also, as you punch the gas from an idle, there is an initial short whooshing sound as the throttle valve opens, it sounds like if you had an air tank with a vacuum in it, and you opened the cap or something and the air whooshing in. Sort of like that.
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