assuming both will get identical port jobs...well that virtually becomes the same as stock vs stock...the Performer may outflow the Cobra by 10cfm...if that...not enough to notice...get whatever is a cheaper find...both good intakes...with lots of potential...
I see you are running AFR's...I run ported lower GT-40 intake with a Cobra upper on my 165's...the car pulls hard from 3000-6000RPM...you won't be disappointed...I had Tmoss port mine...
I already have a Cobra intake. It has been ported by TMOSS. This post is not for opinions about which intake I should buy. I am just interested to see by how much a ported Performer will outflow a ported Cobra.
This is a question thats impossible to answer. It depends entirely on who ported it, if they ported it based on a specific goal or if they just hogged the piss out of it. A ported performer is definatly better than a ported cobra. No one can say "only 10cfm" absolutely impossible to say. With what you have, i'd say your looking for a mild 300hp combo with 6000 max shifts. Leave the cobra. If you were serious about looking to go fast, then you'd need to change more than just the manifold.
The Performer has more usable room to port than a Cobra and can be made to flow more with less work, but below 250-260cfm, the Cobra will hang right with the Performer if ported by a pro. I'm not talking welding and gettin crazy here either.