Air filter, which is best: Stock, K&N, BMC?
#16
+1 for using the OEM filter.
#18
I use BMC. Fantastic Italian quality. I just pull out every year, clean, and apply BMC's supplied red stuff as directed. Plugging MAF is a myth. I did some experiments with my Fluke # 922 air flow meter and it indicated about 15-17% more FLOW with BMC against new OEM papar filter maid by Mahle.
Good filter is a clean filter.
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05' 997.1 C2S 6MT
Good filter is a clean filter.
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05' 997.1 C2S 6MT
A good filter is a properly sized filter for the air flow needed with the smallest pressure loss possible.
I have some experience with BMC filters on power boats but for my Porsches I stick to OEM. MAF a myth I would not say so as there are so many documented MAF problems related to a sportsfilter application. The myth can be busted if the MAF is taken out regularly for inspection and cleaning. At the end of the day changing the OEM air filter to a sports air filter will not have a HP increase, it will only make a bit more intake noise.
#19
I think I can't but agree with most on here...was looking to replace the stock filter with K&N to gain a tig more power but after looking at power graphs & feedback from forum members decided to stay witn stock as the gains were minimal at best.
#20
I have a Werks 1 carbon fiber airbox, which utilizes ITG reusable filters. They work very well and thankfully are cleanable since they cost $350 to replace. The airbox is an after market design based upon the X51 airbox. It is the only after market airbox/filter system that actually improves performance over stock. Everything else is s waste of your money.
#22
Have tried K&N in the distant past on several engines up to 420bhp, measured 0-60 and 30-50-70 times and absolutely no difference.
Only use OEM on this car (997.2TT) as it's a massively expensive engine... I'll settle for a little less intake noise for a little less bore scoring.
Only use OEM on this car (997.2TT) as it's a massively expensive engine... I'll settle for a little less intake noise for a little less bore scoring.
#25
Paper filter for me. Used to use K&N, but it wasn't for the gain, it was so I could reuse it. I usually change the air filter every year or two depending on driving, so if I can pick up a K&N for 50 or so it makes sense if I am keeping the car.
Never had a problem with K&N, nor did I ever feel my car was quicker, got better MPG. Strictly a reusable issue to me.
Never had a problem with K&N, nor did I ever feel my car was quicker, got better MPG. Strictly a reusable issue to me.
#26
Define "easy" for me. Changing spark plugs on a 997 is a major pain in the **** (at least for me)
#27
Well, after all of everyone's input, I stayed with the OEM filter.
Also changed the cabin filter, engine oil and filter, power steering fluid, front diff, rear transaxle & transmission fluids, bled the brakes, flushed the coolant and changed the plugs. The car is 10 years old...and preventative maintenance after this about of time is a good idea.
I think that about covers everything, but now I am thinking, should I change the clutch fluid? Or was that already covered when I had my guy do the transmission fluid? Also, does the '06 C4 have a fuel filter?
I guess that I will have to give him a call.
Also changed the cabin filter, engine oil and filter, power steering fluid, front diff, rear transaxle & transmission fluids, bled the brakes, flushed the coolant and changed the plugs. The car is 10 years old...and preventative maintenance after this about of time is a good idea.
I think that about covers everything, but now I am thinking, should I change the clutch fluid? Or was that already covered when I had my guy do the transmission fluid? Also, does the '06 C4 have a fuel filter?
I guess that I will have to give him a call.
#28
Not true. Air flow follows a principle analogous to electrical resistance. In this case, the air filter is in series with the rest of the intake system. So reducing air filter resistance will decrease total intake resistance. Not saying its a big effect, but the air filter is in series, not in parallel, so it does have an effect.
#29
Not true. Air flow follows a principle analogous to electrical resistance. In this case, the air filter is in series with the rest of the intake system. So reducing air filter resistance will decrease total intake resistance. Not saying its a big effect, but the air filter is in series, not in parallel, so it does have an effect.