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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.

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Old 07-06-2004, 09:48 PM   #1 (permalink)
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I'm looking for the simplist way to increase HP, and have heard that adding a cold air intake is the way to do it. Is there a particular manufacture/produce I should consider, or avoid?
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Old 07-07-2004, 02:46 AM   #2 (permalink)
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NEVER....EVER.... add a cold air intake. Your computer is not configured for mass air flow and it will actually decrease your horsepower unless you configure your ECU correctly. And even when that is done, it will only give you about 3 wheel horse power and still take in water on a day of flash floods. Keep your BMW stock.
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Old 07-07-2004, 03:38 AM   #3 (permalink)
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i wouldnt. it will cost u a lot of money for a decent one. even if u made it, it will probably just suck in warm air. i doubt heatsheilds even work. you will not feel any differnece. then only time the cold air intake will help, if it is even setup right, is when you are up in high rpm. if u drive on the highway, it will just get annoying over time.

if what whataotiko is saying is true, then thats an additional point.
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Old 07-07-2004, 07:51 AM   #4 (permalink)
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i recommend the GruppeM Ram Air Intake. I got one and i stand by it...increase HP that you actually notice, and the sound is phenomenal.

the MAF sensor will adapt to the new intake and will be better and better over time.
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Old 07-07-2004, 08:15 AM   #5 (permalink)
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I don't know why people are so adverse to the idea....

Go for it! ^GruppeM, K&N, Pipercross Viper.......

Combine it with a nice new exhaust and remap the ecu for a nice noticable gain. BMW might be funny about touching it with mods though.
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Old 07-07-2004, 08:45 AM   #6 (permalink)
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Originally posted by Mr White G@Jul 7 2004, 09:55 AM
BMW might be funny about touching it with mods though.
thats true but the beauty of the GruppeM for example is that it will take you no more than 3 mins to take it out and put the stock one back in. The design is flawless.

I doubt the dealers will mind you having an exhaust.

And the software is something you need to get rid of when you go to the dealer for service. I recommend the Shark Injector. It is software that you yourself can upload or download at anytime...so when you go to the dealer, you just plug the unit into your car and revert back to the stock ECU programming.

Dynos and testing has shown with a good exhaust intake and ECU programming, a 323/325 is a shy off of 330 performance.

and if you are wondering how just the gruppeM intake would sound just go to my cardomain page at page 4.
http://www.cardomain.com/memberpage/262483/4
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Old 07-07-2004, 07:39 PM   #7 (permalink)
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in principle cold air might work.
the maf and air intake temp sensors will adapt without the need for stock remapping (computer will enrich appropriately). i am talking to advanced flow engineering in socal, they claim 20hp for 330i (they test all on the dyno, and report appropriately if the gains are modest). probably on the hottest day in death valley, but i will share my findigns here.
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Old 07-07-2004, 09:59 PM   #8 (permalink)
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anyone that thinks a cold air intake dosnt make a true noticable horspower gain hasnt tried one. I have installed the Jim Conforti cold air intake on my 328i and It was noticably faster. not to mention a bell electronics g force meter which saves my ten fastes 0-60 times, my fasteast time was surpassed on my very first run. stock bmw are fast but there are many after market companies that take it one step further. the conforti intake has a full sealed heat shield that you can tell by its design has got to do a better job of keeping warm air out of the engine. Its not mounted in the fender so water is not an issue, it uses the stock ram air ducts to send cool air to its own chamber. check out turner motorsports site for complete pictures and dyno results. I have to admit if you were planning on spending 100 dollars on some no name tube with a cone filter on the end, save your money after all you own a bmw and parts that make a differance like the gruppe m and conforti will cost a bit more.
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Old 07-12-2004, 09:12 AM   #9 (permalink)
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so Ok, lemme get this straight, CAI do indeed work with BMWs, but to yieal max gain ECU upgrade is recomended.
shark injection is the better choice since it can be uploaded or downloaded as needed, so does this mean i should stay away from the TMS chips for example, i see out there, since they are not so easily removed?
what is this euro HFM i keep hearing about, is it different from the MAF and TB? bare with me guys im coming from the Japanese car crowd here.
which is better a 540i HFM or the euro one, which is cheaper, is there a certain setup that has to be done or is preffered with each?
Are there TB upgrades for E36 M3s, are they recomended,
im thinking when i do cop my M i should try to get CAI, prolly Gruppe M, or Dinan, hell maybe even AEM. + Euro or 540i HFM + 540i TB + Shark injection and exhaust. is that setup even possible.

and what about if i get say... Euro cam or Schrick cams + injector upgrades in the future, is the shark injection something i can get redone or dwnload upgraded software to make it compensate for the cams and injectors
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Old 07-12-2004, 04:39 PM   #10 (permalink)
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I got Racing Dynamics cold air intake that costs $250. For the first 2 weeks worked perfect, after that my car became so noisy. I have performance exhaust and it was really loud too. My car was shaking on the low speed. My RPM's went up from 1k gear to 2.
I did not notice any HP gain, I had a feeling that my HP went down instead up, and my car was feeling lazy.
I put the back stock filter and i have no problems at all. My car is running much better and stronger with the stock filter.
Only good thing is that with the cold intake gas mileage was really good.
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Old 07-12-2004, 05:21 PM   #11 (permalink)
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Old 07-13-2004, 11:40 AM   #12 (permalink)
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There is nothing wrong with adding a CAI. For those of you who had one and had problems, I would blame the design or installation.

And no, your ECU doesn't have to be remapped. If you added a combination of mods (CAI and exhuast for example), it may behoove one to add aftermarket software to maximize these new periphials, but a CAI itself does not require DME flashing.

Also if you are worried about dealer issues, Dinan is sold by BMW at dealerships, and they offer a CAI that is of good quality. From what research (not experience) I have done, it looks like the GruppeM might be more cost effective, but either would make a nice investment.

BTW, keep in mind the CAI's are as much asthetic as funcional, if you are looking for mods that will merely boost the performance and could careless about making your engine bay look , then I might suggest investing your money in a chip, or if OBDII equiped, a Shark Injector.
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