Ok so I know you can siamese and port the intake and runners, but has anyone siamesed the plenum, I know you can port it but I want to know if you can match all of it all the way down, port siamesed plenum matched to equally done runners matched to equally done intake. Can the plenum be done what gains would I see??

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1989 Trans Am GTA, 5.7L TPI, TH700-R4, T-Tops, dual cats, 9-bolt rear, 3.27, Dynomax muffler, K&N
1992 Camaro RS, 5.0L TBI, T-5, T-Tops, 3.08, L69 Dual Snorkel, K&N - Sold

Theme song for my GTA Cake - The Distance

 

I dunno about gains specific to that, but I know with SLP siamesed runners it's required that you port to match, and the top of SLP siamesed runners are open into one larger runner tube, know what I mean? The bottom are closed and seperate so you could probably do it there, but I would imagine any gains you see from that intake siamesing would we slightly less low-end torque and a flatter torque curve with higher RPM flow.