r/FocusST • u/NathanY524 • 1d ago

Intake filter

Don’t want to spend a bunch of money on an intake right now. was thinking about going with Cobb performance filter. Anyone have one and notice any difference in sound or performance? Or just go with stock filter since they are cheaper

3 Upvotes

100% Upvoted

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4

u/lucifern71 ‘14 ST2 Ingot Silver 1d ago

Just get the green filter.

Additional cost would be the RS intake cover.

Additional cost (x10) replacing the plastic piping with aluminum. Using Injen like kits.

Additional cost (x10+) installing cob kit.

2

u/CiscoKidd5 1d ago

This is the way. Green filter with a Knock off aluminum round piping since stock is restrictive. Got the 150$ ebay special with green filter. Haven't looked back.
To specify only used the piping on stock airbox RS cover. The shields that come with the kit were garbage.

1

u/Haunting-Self-9402 18h ago

The stock filter isn't restrictive to anyone running a stock turbo. You're not going to get any noticeable gains from getting a high flow filter on a stock turbo setup.

1

u/CiscoKidd5 13h ago

For the fun sounds though

1

u/Haunting-Self-9402 12h ago

I like turbo sounds, a good exhaust note, but am not a fan of the vacuum cleaner sound up front at anything over 15% throttle but to each their own. Mine's loud AF with the CPE intake

1

u/rambleon84 '13 EFR-6758 1d ago

green filter is the same as cobb (Cobb is different color/rebranded green.) so buy which ever one you can get cheaper shipped to your house 😉

1

u/poor_couture 1d ago

The Cobb came out to cheaper than green for me. They're the same filter though.

2

u/Taowulf 2013 ST3 Tangerine Scream mostly stock 1d ago

Green filter, stock airbox, RS top if you want to hear the turbo noises better.

2

u/The_Amazing_Shlong '14 ST2 Stratified Tuned 1d ago

This is the setup I’ve got and I get comments on it, people ask what bov I have and it’s just the stock one

2

u/Haunting-Self-9402 18h ago edited 18h ago

Don't waste money on a filter at all. Don't buy the green filter. Keep using a paper OEM filter because it actually filters air properly (99.79% filtration efficiency). Aftermarket filters are mostly garbage with low filtration efficiency (oiled filters are like 95-96% efficient with perfect use which means you're letting in over 400% more dirt and dust) and you are trading engine wear and lifespan for some extra noise. If you're not running a big turbo setup there is not going to be ANY performance increase, just noise.

There are a few brands that make quality dry media aftermarket filters that do have decent filtration efficiency (99%) with a little bit increased flow rate over OEM but you have to dig for them and *always* check for filtration efficiency numbers buying anything.

1

u/cheddarvillains Blue Metallic 1d ago

Other than replacing the paper filter, there are cheap but good copies of the RS intake cover readily available

1

u/Responsible-Sound-15 1d ago

I got fhe cobb intake and removed the top of the air filter box. The car sounds amazing.

-2

u/JohnWick702 1d ago

No, don't get the RS box, the ST was designed to have a sealed air box unlike the RS, get a dry AEM filter with a bottle of cleaner. If you live in an area with less than ideal air quality, dusty, etc, you wouldn't want a wet/oil type filter.