i know this is a dumb question but i need an answer... and i searched for it already and nothing found.... what is the difference between the 9mm and 15mm?

 

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those dam GREEDY catch cans

 

I'm guessing you're refering to the size of the tubes that go into it. I guess it's just a matter of what will fit your ventilation duct. If you are creating custom ports for the application you could use either (a lot of high reving vtec engines run two ports in drag applications - http://www.theoldone.com)

 

thanks alot anyone else with any experience?