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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 05-12-2005, 10:37 PM   #1 (permalink)
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whats up guys
i was think of getting an intake for my e39 540 not sure which is better cold air or ram air performance wise (as well as better for my car). i was looking at a K&n high flow intake, let me know what u guys thinks, also give me some ideas on high quality brands as well
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Old 05-12-2005, 10:52 PM   #2 (permalink)
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ram air get the aa one it is expensive but adds liek 30 hp
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Old 05-12-2005, 11:56 PM   #3 (permalink)
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where did that ram air HP number come from? a ram air has the potential to be a better performace part but as far as actually 'ramming" the air into your engine it dosen't really make a big diffrence until your going about 100MPH. although it does definatly get the freshest of cold air into your engine i find a 30HP gain from a ram air intake hard to belive. even on drag cars that have the huge scoop sticking way out of the hood the ram air effect doesn't really take place until high speeds. but as i said the ram air kits usually are made to where they get the cleanest cold air into your engine because most CIA's have the intakes down in the fender or the brake ducts, and a ram air kit will usually get the air fromt the front of the car somewhere that is above the street level thus the engine doesn't have to contend with breathing in other cars exhaust
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Old 05-13-2005, 08:06 AM   #4 (permalink)
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Quote:
Originally posted by buuhh99@May 12 2005, 11:52 PM
ram air get the aa one it is expensive but adds liek 30 hp
[snapback]343939[/snapback]

And then get those flashing valve stem lights, those will add another 30 hp.
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Old 05-13-2005, 11:32 AM   #5 (permalink)
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Originally posted by tacroteau+May 13 2005, 09:06 AM--><div class='quotetop'>QUOTE(tacroteau @ May 13 2005, 09:06 AM)</div><div class='quotemain'><!--QuoteBegin-buuhh99@May 12 2005, 11:52 PM
ram air get the aa one it is expensive but adds liek 30 hp
[snapback]343939[/snapback]

And then get those flashing valve stem lights, those will add another 30 hp.
[snapback]344069[/snapback]
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Old 05-13-2005, 01:07 PM   #6 (permalink)
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Interesting question and I agree ram air only comes into play at very high MPH. As to cold air induction (CAI) most of our Bimmers already have that mod (enclosed air intake from the front grill area to the throttle body) If your car does not have the above set up and you are going to add one, ensure the air you take in is from OUTSIDE the engine compartment or you will have a nice flow of hot air and hot air does not add any HP.
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Old 05-13-2005, 08:25 PM   #7 (permalink)
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I've always believed that BMW NEVER/EVER breath PURE cold air and that is by factory defaults.....!!! YEP I mean it.....think rerouting all these air ducts passing from under, up to the radiater "no less" to the filter and terminating at the throttle body......very long convoluted route indeed....that in itself convinced me that BMWs always run on the hot side.....think about it and let me know!

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