HKS drop ins
 

Anyone have them and notice the loose fitment? Are they supposed to be like that?

yes, mine is also loose...

but it seems it cover all space...

I have had mine in for about a month. No issues.

just installed it...noticed a very slight increase in throttle response

I assume these are similar to the K&N drop in filters.

not exactly they are dry foam not oiled cotton and are non reusable

ive had them for about a year and a half in my car with no problems

because they are thinner than the OEM filters there is more room down in the air box but when slide that top down and clamp it down im pretty sure they dont move around

I actually think the HKS filters are cleanable - I know the green-element mushroom style filters are. They're just 3-layer foam so you can either wash them with water or blow them out with compressed air.

I didn't know HKS made these for the 370Z. Ordering some soon...

I almost ordered them but after MC showed me a few pictures (how they are not great at filtering dirt), I just stayed with OEM.

Good Call :tiphat:

yeah ive taken the vaccum cleaner attachment and opened the filter housing up and went over the foam a few times.... so yeah in that sense its cleanable.. what i meant by cleanable was really reusable in the sense that like with a K&N you can actually clean it and reoil it to use the same filter like new... the HKS turn to a pale green after a while and start to get little debris in it that you cant really clean.. also the foam seems to get more porous and brittle feeling that seems non reverseable....

hks is reusable.
Its a little lose but i haven't had any complains from the G37 comunity which uses the same exact filter.

If you guys want an alternative:

AFE makes the pro-dry s filters also. They are also reusable and has OEM fitment.

here's some pictures and the link to our website if anyone wants to order

http://i642.photobucket.com/albums/u...s/DSC_0003.jpg
http://i642.photobucket.com/albums/u...s/DSC_0004.jpg


Amplified Motorsport - AmplifiedMotorsport.com - performance audio auto accessories

i myself still run them even though showed you that but i swap them out like every 5K miles or something.... i dont think they are bad for the car or anything but a few tests have shown that the foam isnt as good as the paper OEM as far as filtration... they of course breathe better as they are so much thinner...i wouldnt say they add any "real" HP... i just use them because i have HKS exhaust parts and just happen to like the brand....

so i wouldnt tell anyone not to get them and i would probably run them over an oiled filter... but honestly OEM is gonna be fine and if you want something more than that might as well get a short ram cone intake system

nismo japan used to make drop in dry filters for the 350z.. they were like 20% more free flowing but were expensive .. i paid like $100 for a set of paper filters with a nismo logo on them.. havent kept up with them to see if they have any for a 370

yeah i mean you can buy sheets of the foam from HKS and cut new squares but the actual set of filters you buy arnt reusable in the sense K&N's are.. ive been through 3 sets of the HKS in 2 years.. that foam gets real washed out looking and almost brownish

I like that. Thanks for posting. :tup:

It's all in yor head my friend.

Honestly, these things scare me. I would never use them.

So I just installed my K&N high flow filters. If I am in first or second gear and rev up to a out ohhhh.. 3k rpm then let the rpms fall while driving, i hear an odd hissing/sucking sound. I can't tell if this is due to my PowerHouse Amuse exhaust or the K&Ns.

Any thoughts? SORRY to derail....

Sounds like the normal sound you get with the K&N (and probably other intake set ups as well). Personally, the improved sound (including those you describe Endgame) is the main reason to add better flowing filters.

COOL!! I like the sound, just wanted to make sure it was normal...

so wat's the verdict?

OEM vs HKS drop-ins vs K&N drop-ins?

im still on stocks... not very convinced HKS or K&N will make any difference...

I'm weary of K&N drop-ins because we have hot-wire MAF's and I've had 2 destroyed in my Evo due to an oiled filter.

I think a smooth intake tube + new filter will make roughly 10 WHP. I'll dyno it next month. The AFE filters are sounding pretty good, but HKS filtration is more than sufficient.

I like K&N for the re-usability, improved sound and improved air flow. I never over oil them. I've not tried some of the other solutions discussed here, though.

I have to say the the stock filters were better than most. And the intake system is well designed for a stock set up. Obviously, others have improved on it. But compared to most of the restrictive systems on other cars, the Z's is a breath of fresh air (that's an intake joke, by the way).

Sounds good. Keep us posted on your experiment.

Professordave- complete agree that the stock setup is pretty sufficient. I ran scanguage IAT and it was better than expected. As far as cool air its plenty good... I just want to improve the filters if there's room.

A slightly wider MAF section like what Modshack is doing will net you some gains. I think you will get a few HP from better flowing filters but not sure about smoothing out the intake tubes, I dont think the air gets too turbulent to begin with. But who knows.

Drop in filters won't do a whole lot when it comes to HP, they are designed to slightly improve airflow but the biggest benefit is that you can reuse them instead of buying a new oem every 10k miles

The only thing larger MAF housings on a car that already has 2 ~2.5" housings will gain is a leaner mixture. Without re-scaling your MAF within the ECU ROM, it's just going to lean out your mixture - which will net you some nice gains on the stock tune. Think about the surface area of 2 separate housings. That's massive to begin with - compare that to what has been accomplished with just one MAF and throttle body on the non-HR 350Z.

Even Evo guys are fine with the single ~2.75" MAF which is pre-turbo (non-compressed) until 600 WHP or so. After then, it causes a measurable restriction.

yah, this is where i keep ending up... i cant see myself spending extra over stock filters for a freer breathing filter that cant really translate any more than a few hp improvement. such small change (like 3-4whp) is like the difference between driving in a humid or dry morning.


anyone try with the ARC intake tube yet? :)

I've been using the HKS filters with Cobb tubes for a bit now. Sound is more pronounced, and response is much better than stock. No idea on any power numbers but it's a fair improvement for driveability. I'd be willing to try the AFE filters next after these wear down.