I was thinking about this while reading a thread and just curious of powerband differences if both are tuned. I know a stock gsr manifold benefits from the p72 ecu because it opens the butterflies, offering optimimum low and mid range power, but hurting top end a bit, even more if built. If you use a single runner manifold like skunk2, blox, etc. with a p28 ecu, so you dont have the IAB function, are you going to feel noticable loss in low end torque still? I would think that would perform just like a regular single runner manifold if it doesnt have the butterflies, no IAB function, and tuned of course. My question is how would they compare performance wise? Obviously an aftermarket single runner manifold will have more top end simply by the design, but will low end suffer? Is the loss in top end worth the gain in low and mid range if using the dual runner manifold with the p72? Which is the overall better choice?

 

Nobody?

 

I'm not sure if i have the answer but i'm running a stock gsr with no butterflies. My stock gsr tuned dynoed at 169.9whp on 92.

 

The stock GSR manifold was designed for low to mid range torque/power. The secondary butterflies gave it better top end and is an excellent manifold in general. It has power advantages over a single plane manifold (type R style) but doesn't make the top end power numbers some people want without a lot of money for proper port work etc, going into it. Like every build, you need to properly plan it out before you start building it to make sure it's intended use matches the engine parts chosen. In some cases, the GSR intake would be the way to go, it's up to the individual to decide for themselves.

 

I fully endorse this post. Well said mang.

 

What is it you exactly want to know? Performace wise the GSR is better in my case below 6000rpm. Yes my low end and mid range was crap after I changed to a Performer X manifold. My first tune was down 20ft/lb's, got it retuned much better only down 10ft/lb's at one rpm location.
If you drive your can in town a bunch and don't go above 6000 much stay with the GSR. If you drag race or are between 6000-redline a single runner is the way to go.
One other note I maxed my PnP'd GSR manifold out at 184whp/134tq.

Link to may story.
Disappointing Results with a Performer X, huge torque loss and minimal hp gain
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/disappointing-results-performer-x-huge-torque-loss-minimal-hp-gain-2776313/

 

How you drive the car is important for sure but matching the nitake manifold to the cams is critical. Then the intake and exhaust need to be matched to the IM and cams...that's the approach you need to take.

 

Well said.