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The End All RBC Manifold Questions Thread

273546 Views 921 Replies 247 Participants Last post by  Nicolas22S
[Updated on 4/20/2009, updates are in Red]

Okay, there have been a lot of threads in regard to the RBC Manifold. All throughout those threads are dyno charts, questions, answers, and pictures. I am going to try to condense those threads into one sticky in order to cut down on the amount of RBC threads.

Generally speaking, when a vague question is asked, a vague answer will be given. You can’t expect a person to be able to tell you what kind of gains should be expected for your particular application because there are too many different variables to consider. We can only provide you with what we know based on actual instances where the RBC manifold has been applied and dyno-tested. The rest of the information contained herein is basic Q&A.

If a mod reads this, please sticky it if you deem it worthy. Also please add any information if I left something out.

Questions and Answers:

Q: What is the RBC Manifold… what vehicle did it come from?
A: The RBC Manifold originated on the Accord Euro-R but is also found on the USDM Civic Si starting with the 06+ models.

Q: What’s the difference between the PRC Manifold, the PRB Manifold, and the RBC Manifold?
A: The PRC Manifold comes from the 02+ Integra Type-R, which utilizes internal velocity stacks and short runners. The PRB Manifold is the stock Manifold on our USDM RSX Type-S. The RBC Manifold has short runners and higher flow capabilities than the PRB. Much more high-end power can be made by using the RBC. Think of it this way: RBC>PRC>PRB.

Q: Where can I get the RBC Manifold? What’s the part number?
A: You can find the RBC Manifold on any Honda dealer site, or you can buy them directly from your local dealer. Prices vary from dealer to dealer. The OEM part number is 17100-RRB-A00. You can also find them on the CRSX store modified and ready-to-go, or if you're the type of DIY'er like myself, they sell the stock manifold as well.

Q: Will the RBC Manifold fit onto my
A: Yes and no. Yes, it will, but you will have to make modifications to it. First things first, you will have to cut off the water passage on the side of the intake manifold for it to even fit. Secondly, if you’re using an aftermarket intake manifold gasket like the Hondata, you have to drill a hole in it for the intake coolant passage. Additionally, you’ll need to use an aftermarket adapter plate like the one made by Karcepts. They have an extensive write-up on how to adapt the RBC manifold to fit the K20/K24 heads with the usage of their adapter plate and a Hondata intake manifold gasket. They also provide OEM part numbers for the gaskets needed. The stock coolant hose is too short in some cases and will need to be exchanged with another factory hose, whose part number is also listed in the write-up. After all, is said and done, there are some fitment issues that might need some attention. The throttle may not open all the way if the adapter plate is mounted incorrectly. This can be fixed by unscrewing the adapter plate and realigning it. The hood may not close properly on some vehicles, but this can be easily solved. The link for the write-up, which is a must-read if you’re considering this upgrade, can be found at: Installation Instructions.pdf. The CRSX store also sells the modified manifold.

Q: Will I need a Hondata K-Pro in order to run this manifold?
A: No. However, the only way you're going to maximize the potential of the RBC is by tuning your ECU. A K-Pro is HIGHLY encouraged.

Q: Will I run lean if I put the RBC on?
A: It depends on how many mods you have. There are a lot of people who are running the RBC with the Hondata IMG and report no problems whatsoever.

Q: Will I need the Hondata Intake Manifold Gasket to run the RBC?
A: No, but it is HIGHLY encouraged. The Hondata Intake Manifold Gasket is made of a hi-temperature-resistant plastic material that reduces the amount of heat soak from metal-to-metal contact in the intake manifold. The head and the intake manifold are normally separated by a thin metallic gasket. Under normal driving conditions, the heat from the head is transferred to the intake manifold which causes the air being passed into the manifold to be heated. The conditions worsen under high rpms and abuse. The Hondata Intake Manifold Gasket separates the manifold from the head and causes a significant drop in the temperature of the air being passed into the manifold which in turn, causes better combustion and improved fuel economy. You can learn more about this at the Hondata website here: Heatshield and purchase them here:>+Intake+Manifold+Gaskets&universal=yes&limit=25 The CRX store also sells the modified IMG, which has the hole drilled out for the water passage.

Q: Can I use the stock throttle body on the RBC manifold?
A: Yes, with the use of the Karcepts adapter plate. If an aftermarket adapter plate is not used, you cannot use the stock throttle body.

Q: Can I run the RBC Manifold with a boost?
A: Yes you can, but there may be some issues concerning the intercooler piping. I had an adapter plate linked here that would make it work, but it appears that of 4/20/2009, the manufacturer no longer makes it. I am in the process of finding a new one.

Q: Will the RBC work with my CAI?
A: Yes, and there are several ways to ensure proper clearing. Club RSX carries a hose that allows much more clearance for the CAI. You can find the hose here: You can also utilize the Injen elbow, which you can cut to fit to ensure proper fitment.

Dyno Charts (strictly for reference):
2005 Type-S Dyno with RBC + Bolt Ons
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its about time someone did this. good write. i think its sticky worthy
from what I understand the Hondata IMG(or similar from another company) is a must cuz you have to poke a hole into it for some vacuum hose
Thank god someone did this. :)
brilliant. no more rbc threads. +rep
Is there anyway a fujita cai can fit using the rbc manifold?
an intake hooks up to the throttle body. The throttle body hooks up to the intake manifold with the karcepts adaptor.
ive heard if you use the injen cai u wont have any clearence issues because of the adjustable elbow. and ive herd using other cai(aem,fujita,) will give u room problems if u install the rbc.
"Will the RBC Manifold fit onto my K20A2/K20A3/K24?"

Not to be picky, but maybe add k20z1 so you don't get the question.

+ rep for a needed thread
"Will the RBC Manifold fit onto my K20A2/K20A3/K24?"

Not to be picky, but maybe add k20z1 so you don't get the question.

+ rep for a needed thread
Consider it done... :thumbsup:
I have Hondata IMG and I never drilled a hole for any coolant passage. So it doesn't HAVE to be done
I have Hondata IMG and I never drilled a hole for any coolant passage. So it doesn't HAVE to be done
I'm going by what was put out in the Karcepts DIY.
Not necessarily true; different setups/cars call for different manifolds, i.e. there are many cases in which the PRC puts up better numbers than the RBC, I personally will go w/ the PRC form my setup
Good Summary non-the-less
I have Hondata IMG and I never drilled a hole for any coolant passage. So it doesn't HAVE to be done
It is not for a coolant passage. It is for an air passage. It is the idle bleed air that goes to the ports around the injectors when the engine is cold. The PRB hooks up to this with a passage near port 4. On the RBC the passage is near port 3. It is just a simple round hole about 3/16 " in diameter. The car will run without it, but fast idle when cold may not be as good since the IACV will have to do all the work and it can't dump the air at the tip of each injector the way the this thing does.
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whats so dangerous if you run this w/o kpro on a car with i/rh/e?
whats so dangerous if you run this w/o kpro on a car with i/rh/e?
Run too lean and melt your pistons and burn your valves. The stock fuel maps are rich at WOT, but only so rich. With enough mods you end up using up all the "padding" built into the stock maps and end up lean.

In normal driving the O2 sensor keeps you at 14:1 or so, but at WOT the ECU dumps exactly whatever amount of fuel that the fuel map says--so you are screwed if you have improved the flow of air into the engine too much for the stock fuel map.
Still no sticky?
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