Looking to order a new air filter with a velocity stack built into it. I had the apexi power intake kit (for the s5) and have ditched the AFM with a AP engineering PFC with a 3" TID and was forced to use a 3" flanged ebay filter I had laying around

I'd like to stay with an apexi filter but I called apex usa and they said that I would need to make my own adapter (those of you who have one or have seen an apexi filter will know why).

I'd like to stay away from the HKS filter simply because it doesnt last long with it's urethan foam design. Most of you guys are probably running a big K&N but I dont think offer any with a built in velocity stack.

Other options I can think of air the blitz filter or the greddy one, but there isnt much feedback on those brands that I could find.

Any input is welcome. I'm trying to get this before the weekend when I hit the dyno.

 

Lots of views but no posts.

So does this leave me to assume the majority of people are just using K&N filters and not many have experiences with HKS, blitz, or the greddy filters?

Anybody have experiences with daily driving a 300whp t2 with the HKS megaflow intake? How often do you have to change the filter? How soon until it becomes hard? From what I understand the HKS wet element can only take a certain amount of heat cycles and then it needs to be replaced so this is playing a huge factor in which filter I will choose.

 

I think most people don't know what to make of velocity stacks in general. Have you thought about trying to make your own stack within the K&N? (Although a little more difficult. But then again, I've always been told using a stack on a turbo is pretty useless.

 

Havent thought of making my own velocity stack in a k&n but I'd probably cause more air turbulance trying to design my own.

I've been told the velocity stack makes an enormous difference but have yet to see actual numbers on whether a velocity stack helps or not. Wanna share why they'd be useless? Just trying to get my facts straight.

 

Well, the problem with stacks is they're all different and effect every car considerably different depending on what's done to it (you probably already knew that), and they are just used to move the powerband around, usually since they'll kind of match the intake velocity at a specific RPM where you want your peak power/torque/whatever. I guess from what I hear on a turbo car since the flow rate through the turbo vs rpm is usually pretty variable it was hard to get a good effect (don't quote any of this as right, this is just what I've seen other people mention in my digging around for more info on the subject).

 

I dunno what your hang-up is on requiring a velocity stack.
There are proven cars that run 400hp+ not requiring such things.
Why bother?


-Ted

 

The person tuning my car recommended that I get one and he has much more experience with these things that I do myself. My car wont hit 400whp with my current setup but I'm pushing for every extra bit I can. I know an air filter with a velocity stack isnt required but an upgraded turbo isnt either.

So what's your input on filters like the HKS megaflow or Apexi unit? Pretend like price isnt a factor.

 

I have a HKS filter, and you're right, it doesn't last very long. If you daily drive your car, I would suggest Apexi. I drive my car perhaps twice to three times a week, for no more than 20 miles each day, and I need to change my filter element probably once every 3 months. It gets dirty quickly, but I haven't had any probs of it hardening, guess I didn't leave it in there long enough.

 

Another issue I've seen with the HKS filter is that is doesnt actually filter as well. There was a japanese magazine that did a test of the power gains on the major filters an they were all similar. Then they hooked them up to a vaccum cleaner and vaccumed up sand. If I remember right, the Apex and K&N did the best, but i def. remember that the HKS was the worst.

 

^Everyone has seen that test with those filters but I like to go by first hand experiences.

 

I think it's time to find a new person to tune your car...

HKS - overpriced, gimmicky
A'PEXi - overpriced, overrated; ever since that stupid Supra site, EVERYONE jumps on the bandwagon cause of the 1hp difference in the test - stupid.

I prefer K&N universal cone filters.
Priced right and with a million mile warranty and reusable!


-Ted

 

Wasn't Apexi the one that sponsored the test? I thought I read somewhere that was the case, so it's not exactly "unbiased."

I used to have a K&N too, but the washing, drying, and re-oiling part kinda got to me. HKS was easy, unbolt the cage, swap in the new element, and you're done, no down time on the car. Crappy part is the price of the elements and how quickly it dirties.

 

One of the Weapon R filters have a velocity stack. Although you will have to drive around knowing you put a Weapon R product on your car :p

 

have you checked out K&Ns new "x-stream" filters? the specs say they have a built in velocity stack.
i purchased one of their 2.5 inch universal filters that goes right onto the stock S5 AFM.

http://www.knfilters.com/universal/X-stream.htm
(scroll to the bottom for the universal filters)

- Aaron

 

Thanks for the link. I'll check them out.