I've ended up buying a HKS and pipercross filter and can't decide which to fit, anyone tried both? The Pipercross looks more a conventional filter where the HKS is more a foam like filter

 

I've got a Pro R one that's done about 10 miles (no joke) up for grabs if you'd like to add it to your collection!

Nothing wrong with it, but it just wasn't for me that's all.

It's for an 07 STi, so may fit?

 

I have the HKS filter fitted and the car performs fine. Having said that, I have noticed that the HKS filters don't do well in filtration tests. I'm not sure about the Pipercross filters.

 

A bit of research says neither are favoured. It seems the k&n always comes out on top.

 

Really doh, Thought the HKS might be less restrictive and aloe more air, but this is a guess not from any knowledge, as regards filtration tests, that would be a very important part to play

 

I had one exact like that hks one mate but decided to keep my k&n green one

 

So should sell both buy K&N lol

 

Makes sense. You'll make a fortune for them on eBay

 

Lol well votes seem to be Going HKS way

 

Anymore input?

 

I had a pipercross one on my blob when I got it and it was shyte swapped it for an STI one I had in the garage and car runs a lot better.

 

I cant see the pics at work, but i dont like foam filters as they degrade and break up.
i have no experience of the HKS mushroom filters, but i did have a pipercross viper i think it was some years ago, that was fully enclosed in a carbon body, and the foam inside did indeed break down and i can only guess got sucked into the engine and the car ate it lol...
that was on an NA car tho, so no turbo to damage.

personally i only buy cotton filters, like K&N

 

Neither. Green or k&n.

 

Is it a genuine hks, did it come from ebay ?? That place is absolutely full of fakes, even I got caught out by one.

Id sell them (never been a fan of pipercross) and get a cosworth, green or k&n.

 

http://www.scoobyparts.com/acatalog/Air_Filters1.html

 

How do i know if its fake?

 

Where did it come from ???

 

This test is interesting

http://www.fastcar.co.uk/2012/05/04/...filter-test/9/

 

In all honesty, you will see may be 1hp difference if any, so I wouldn't worry. The HKS does have poor filtration test results though. Stick with a standard one and ave yourself some fuel money!

 

Cosworth for me

 

On that test they said cone filters are the best, so might have to look into one for future, but seen as my ecu is not mappable, may have to stick to panel filter

 

I've always wondered about the effectiveness of cone filters v's the Subaru ram air filter.

Is a filter in a hot engine bay more effective than one fed by cold air from the front grill?

 

Not mappable, whys that ??
Every impreza ecu is mappable. Some just require a different method.

 

What are your power goals?
Surely if you are not even going to map the ecu, there is no point in changing the filter??

 

For what its worth, Andy Forrest told me to put a K&N panel filter in prior to my remap, prior to that I had one of the STI filters

 

I've got a prodrive ecu nope it can't be remapped not even the original ecu, i've contact mappers and asked on here its 1998 model and without buying new ecu which cost over £1000, its just on my year for some reason

 

Can you not have an esl daughter board for that at half the price?

 

http://www.enduringsolutions.com/


The search button is your friend.
As I said, every impreza ecu is mappable, some just require a different route

 

Not sure if already already seen it, only problem is don't know anyone who's used them before

 

Its currently the only method of mapping your car and in my opinion its fantastic value for money.
Much better than the likes of apexi pfc and at £295 plus mapping id even choose this over a simtek.

PM Andy Stevens on here and discuss it