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DOOH, sorry I am pain meds this morning. I meant that the RPM IS a single plane and the Performer is a split plane.

I went with the Performer because I was looking for a better flow, cooler manifold temp and I wanted me power lower in the RPM range. Plus, it looks pretty close to factory.

If you are looking to get your power with lower RPMs then the Performer is a great manifold.

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LOL, the Performer AND the Performer RPM are BOTH dual plane manifolds.
The Performer saves you some weight over the factory iron piece, but very little as far as performance increase.

The Performer RPM is a VERY good manifold, just too tall for a lot of applications. Makes a lot of lowend grunt along w/ good upper rpm power.

The Holley SD has almost all the same characteristics of the Performer RPM (good lowend torque and drivability as well as good upper rpm power) even though it is a single plane and is a shorter manifold.