I bought the AFR165 too, and as I would do some port work on the heads (along with my cobra intake - gasket match, intake ports match, etc), and it´ll take a while, now I´m using temporarily my stock intake. Considering my previous upgrade (see my sig), man, do this intake have low down torque!! However, it simply dies at 5000... It shoud be worse if you use AFR165, E cam and stock intake. My point is you´ll definetely lose power up there, but will have some fun at low end (and you could enjoy your car while waiting for an upgrade!)