Port Matching -7's To Rb26 Manifolds

[Cowboy1600]

How would you loose performance? I'm not trying to be a smart ass, seriously am curious.

I have two sets of manifodls one standard and one ported. Shouldn't I use the ported ones?

Port matching and ported are two different things.

I'd be amazed if port matching resulted in a loss of performance but as has been said, I'd be surprised if got got a measurable increase in performance at the power levels the OP is chasing.

It seems to me that standard RB manifolds are quite capable of running pretty solid numbers without any attention from the die grinder.