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Message: [QUOTE="Snake, post: 410718, member: 97"] I'll chime in with what I know: [B]Gogo Stage 1[/B] Assembled / disassembled using button head socket cap screws. Each side of the intake plenum has a lid secured by these, and the manifold bolts to the engine from the plenum floor using the same style screws. Absolutely no restrictions to the ports from front to back. Everything is welded, no epoxy. Ports are all matched. Not offered with an EGR valve or EGR cooler. Showed a 55% increase in flow to the rear cylinders, and looking at the porting I don't question this. The stock manifold would flow 159 CFM to the rear most cylinder on the driver's side (Cylinder 8). Cylinder number 6 right in front of it would flow 170CFM. It was pulling air through the manifold at 28" of water. After cutting the tops off, machining the floors and adding the taper to the ports. Cylinder number 8 now flows 247CFM. And cylinder 6 now flows 244. This is a 55% increase of available air to the rear cylinder. Personal experience -- after 40k miles of use, I pulled the Gogo manifold to repair blown head gaskets and a clogged oil cooler. The inside of the manfold looked almost exactly as it did the day it was installed, which is to say spotless. No build up. No residue. The only exception was behind the last runners where there was a little residue, but this was expected. Definite SOTP performance gains, but nothing I've backed up on the dyno. [/QUOTE]

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