i have seen these on tons of evos but what exactly do they do? is it just a shiney thing to put under your hood for a little show or does it have any performance oriented benifits? thanks and sorry for the noob question.

 

Short answer:

Oil/blow-by escapes the valve cover through the PCV valve and breather connection.

Oil in manifold = lower octane rating
Oil in intake = oily intercooler= reduced cooling efficiency

A catch can is like a trap for these oily solids/blow-by

 

Can anyone recomend a good one?

 

Refer back to post #2.

 

what? post 2 didnt reccomend any... i think i am going to get the cusco one because i think it looks the best and it is cheap! if you have any other suggestions let me know

 

cant ya just put a filter on the outlet and block off the intake part?

 

Saikou_kun sells catch cans, that work.

 

oh thanks haha

 

Edit

 

Thank you

 

 

the saikou one isnt blingy enough for me haha. seems like it works well though. are there any really shiney ones like the cusco one that work as well as the saiuko one? any other recomendations on a shiney one that works well?

 

Ummm, so you would rather get a bling part as opposed to one you know works?

 

yes

 

I like my oil in the engine, not on it.